Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Notional Amounts of Derivative Instruments (Details)

v2.4.0.8
Financial Instruments - Notional Amounts of Derivative Instruments (Details) (Interest Rate Contract [Member], USD $)
12 Months Ended 84 Months Ended 12 Months Ended 84 Months Ended
Dec. 31, 2013
Effective Date June 5, 2013 [Domain]
May 28, 2020
Effective Date June 5, 2013 [Domain]
Dec. 31, 2013
Effective Date June 5, 2013 [Domain]
Maximum [Member]
Dec. 31, 2013
Effective Date August 14, 2012 [Domain]
Jul. 31, 2019
Effective Date August 14, 2012 [Domain]
Dec. 31, 2013
Effective Date August 14, 2012 [Domain]
Maximum [Member]
Dec. 31, 2013
Noncurrent Derivative Assets [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Noncurrent Derivative Assets [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Other Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Non-current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Non-current Liabilities [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2013
Non-current Liabilities [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Non-current Liabilities [Member]
Designated as Hedging Instrument [Member]
Derivative [Line Items]                            
Interest Rate Derivative Liabilities, at Fair Value                 $ 13,484,000 $ 0 $ 0 $ 5,134,000 $ 0 $ 21,290,000
Interest Rate Derivative Assets, at Fair Value             98,123,000 0            
Notional Amount of Interest Rate Derivatives $ 0   $ 0 $ 0   $ 0                
Derivative, Inception Date   Jun. 05, 2013     Aug. 14, 2012                  
Derivative, Maturity Date   May 28, 2020     Jul. 31, 2019                  
Derivative, Average Fixed Interest Rate 2.05%     1.98%                    
Debt Instrument, Description of Variable Rate Basis One-month LIBOR     One-month LIBOR