Subsidiary Guarantors - Improper Calculation - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Issuers
Current assets
Intercompany receivable	$ 1,204,759	$ 1,100,834
Investment in subsidiaries	394,331	453,237
Guarantor Subsidiaries
Current liabilities
Intercompany payable	1,220,390	1,113,704
Eliminations
Current assets
Intercompany receivable	(1,223,326)	(1,116,500)
Investment in subsidiaries	(827,295)	(984,600)
Current liabilities
Intercompany payable	$ (1,223,326)	(1,116,500)
Improper Calculation | Restatement Adjustment | Issuers
Current assets
Intercompany receivable		(80,000)
Investment in subsidiaries		453,200
Improper Calculation | Restatement Adjustment | Guarantor Subsidiaries
Current liabilities
Intercompany payable		(453,200)
Improper Calculation | Restatement Adjustment | Eliminations
Current assets
Intercompany receivable		80,000
Investment in subsidiaries		(453,200)
Current liabilities
Intercompany payable		$ 453,200