Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Liabilities
Interest rate swaps, Current	$ 21,155	$ 23,327
Deferred revenue, Current	1,004	2,313
Asset retirement obligations	8,978	3,698
Other, Current	1,833	3,394
Total, Current	32,970	32,732
Interest rate swaps, Noncurrent	39,494	21,872
Deferred revenue, Noncurrent	1,324	1,217
Other, Noncurrent	6,890	7,568
Total, Noncurrent	$ 47,708	$ 30,657