Annual report pursuant to Section 13 and 15(d)

Leases (Details)

v3.3.1.900
Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 10,500 $ 10,500 $ 10,000
2016, Minimum Payments 2,620    
2017, Minimum Payments 2,220    
2018, Minimum Payments 2,219    
2019, Minimum Payments 2,197    
2020, Minimum Payments 2,056    
Thereafter, Minimum Payments [1] 29,664    
Total, Minimum Payments $ 40,976    
Land Site Leases [Member] | Maximum [Member]      
Operating Leased Assets [Line Items]      
Initial Term of Lease 30 years    
Renewal Term of Lease 60 years    
[1] Includes certain lease option renewals that are reasonably assured.