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New Accounting Pronouncements - Cumulative Effect on Balance Sheet (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jan. 02, 2018	Jan. 01, 2018	Dec. 31, 2017
Other assets
Deferred income taxes	$ 384,777		$ 392,987		$ 390,943
Current liabilities
Accrued expenses	132,589		137,382		125,688
Shareholders' equity (deficit)
Retained deficit	(962,043)		$ (1,061,468)		$ (1,051,818)
Retrospective adjustments
Net cash provided by operating activities	207,085	$ 213,918
Net cash used in financing activities	205,771	52,818
Balances Without Adoption of ASC 606
Other assets
Deferred income taxes	383,092
Current liabilities
Accrued expenses	121,539
Shareholders' equity (deficit)
Retained deficit	(953,505)
ASU 2014-09 \| Effect of Change Higher / (Lower)
Other assets
Deferred income taxes	1,685			$ 2,044
Current liabilities
Accrued expenses	11,050			11,694
Shareholders' equity (deficit)
Retained deficit	$ (8,538)			$ (9,650)
ASU 2016-15 \| Adjustment
Retrospective adjustments
Net cash provided by operating activities		18,000
Net cash used in financing activities		$ 18,000