Annual report pursuant to Section 13 and 15(d)

Schedule I???Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details)

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Schedule I—Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Net cash used in operating activities $ (249) $ (171,099) $ (137,044)
Cash flows from investing activities      
Property, plant and equipment, net (2,315,081) (2,912,080) (2,645,553)
Net cash provided by (used in) investing activities (2,353,399) (2,974,528) (2,684,433)
Cash flows from financing activities      
Debt issuance and deferred financing costs (114,724) (169,924) (101,787)
Distributions to owners (99,025) (99,018) (98,979)
Net cash provided by (used in) financing activities 2,524,164 2,591,058 2,206,734
Net increase (decrease) in cash, cash equivalents and restricted cash 170,516 (554,569) (614,743)
Cash, cash equivalents and restricted cash—beginning of period 434,428 988,997 1,603,740
Cash, cash equivalents and restricted cash—end of period 604,944 434,428 988,997
Balances per Condensed Balance Sheets:      
Cash and cash equivalents 0 146,221 248,830
Restricted cash 604,944 274,557 195,702
Total cash, cash equivalents and restricted cash 604,944 434,428 988,997
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net cash used in operating activities (52,488) (43,723) (40,948)
Cash flows from investing activities      
Property, plant and equipment, net 0 (671) 0
Investments in subsidiaries (2,428,967) 12,832 (61,350)
Distributions received from affiliates, net 217,994 18,400 108,625
Net cash provided by (used in) investing activities (2,210,973) 30,561 47,275
Cash flows from financing activities      
Proceeds from issuance of debt 2,560,000 0 0
Debt issuance and deferred financing costs (73,060) 0 0
Distributions to owners (99,025) (99,018) (98,979)
Other 3 0 0
Net cash provided by (used in) financing activities 2,387,918 (99,018) (98,979)
Net increase (decrease) in cash, cash equivalents and restricted cash 124,457 (112,180) (92,652)
Cash, cash equivalents and restricted cash—beginning of period 109,950 222,130 314,782
Cash, cash equivalents and restricted cash—end of period 234,407 109,950 222,130
Balances per Condensed Balance Sheets:      
Cash and cash equivalents 0 109,950 222,130
Restricted cash 234,407 0 0
Total cash, cash equivalents and restricted cash $ 234,407 $ 109,950 $ 222,130