Subsidiary Guarantors - Improper Calculation - Condensed Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Issuers
Condensed Consolidating Statement of Operations
Equity interest in income	$ (18,083)	$ (13,240)	$ (71,966)	$ (19,088)
Eliminations
Condensed Consolidating Statement of Operations
Equity interest in income	$ 71,038	29,239	$ 238,993	41,218
Improper Calculation | Adjustment | Issuers
Condensed Consolidating Statement of Operations
Equity interest in income		13,200		19,100
Improper Calculation | Adjustment | Eliminations
Condensed Consolidating Statement of Operations
Equity interest in income		$ (13,200)		$ (19,100)