Long-term Debt - Opco Credit Agreement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 2,082,368	$ 2,124,611
Loss on extinguishment of debt	0	(4,132)	$ (146,787)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	20,000	0
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,423,026	$ 1,489,481