Condensed Consolidating Financial Statements (Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Income Statements, Captions [Line Items]
Revenues, net	$ 634,646	$ 632,165	$ 2,026,057	$ 1,901,985
Operating expenses
Technical and operating (excluding depreciation and amortization)	338,799	293,096	915,336	814,999
Selling, general and administrative	137,116	156,308	473,760	469,767
Restructuring expense	19,312	2,631	19,666	5,941
Depreciation and amortization	22,282	20,862	63,467	62,429
Total operating expenses	517,509	472,897	1,472,229	1,353,136
Operating income	117,137	159,268	553,828	548,849
Other income (expense)
Interest expense, net	(29,204)	(31,370)	(90,566)	(95,736)
Share of affiliates' income	0	0	0	0
Loss on extinguishment of debt	(2,295)	0	(50,638)	0
Miscellaneous, net	2,988	(7,640)	(22,610)	(6,486)
Total other income (expense)	(28,511)	(39,010)	(163,814)	(102,222)
Income from operations before income taxes	88,626	120,258	390,014	446,627
Income tax expense	(21,157)	(43,358)	(119,090)	(155,609)
Net income including noncontrolling interests	67,469	76,900	270,924	291,018
Net income attributable to noncontrolling interests	(2,076)	(4,130)	(14,908)	(14,319)
Net Income (Loss) Attributable to Parent	65,393	72,770	256,016	276,699
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	(2,065)	(175)	(6,940)	(578)
Operating expenses
Technical and operating (excluding depreciation and amortization)	(687)	(188)	(2,064)	(565)
Selling, general and administrative	(1,594)	(26)	(4,849)	(44)
Restructuring expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	(2,281)	(214)	(6,913)	(609)
Operating income	216	39	(27)	31
Other income (expense)
Interest expense, net	0	0	0	0
Share of affiliates' income	(105,699)	(94,842)	(473,733)	(504,870)
Loss on extinguishment of debt	0		0
Miscellaneous, net	(216)	(39)	27	(31)
Total other income (expense)	(105,915)	(94,881)	(473,706)	(504,901)
Income from operations before income taxes	(105,699)	(94,842)	(473,733)	(504,870)
Income tax expense	0	0	0	0
Net income including noncontrolling interests	(105,699)	(94,842)	(473,733)	(504,870)
Net income attributable to noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to Parent	(105,699)	(94,842)	(473,733)	(504,870)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	0	0	0	0
Operating expenses
Technical and operating (excluding depreciation and amortization)	0	0	0	0
Selling, general and administrative	0	0	0	0
Restructuring expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	0	0	0	0
Operating income	0	0	0	0
Other income (expense)
Interest expense, net	(29,250)	(19,197)	(89,992)	(59,571)
Share of affiliates' income	110,101	119,870	498,281	522,142
Loss on extinguishment of debt	(2,295)		(50,638)
Miscellaneous, net	(123)	1,707	(373)	(50,645)
Total other income (expense)	78,433	102,380	357,278	411,926
Income from operations before income taxes	78,433	102,380	357,278	411,926
Income tax expense	(13,040)	(29,610)	(101,262)	(135,227)
Net income including noncontrolling interests	65,393	72,770	256,016	276,699
Net income attributable to noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to Parent	65,393	72,770	256,016	276,699
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	484,704	494,636	1,559,188	1,498,447
Operating expenses
Technical and operating (excluding depreciation and amortization)	251,595	220,918	665,627	607,176
Selling, general and administrative	97,633	112,607	343,526	345,174
Restructuring expense	18,764	230	18,806	902
Depreciation and amortization	9,965	9,344	29,992	27,514
Total operating expenses	377,957	343,099	1,057,951	980,766
Operating income	106,747	151,537	501,237	517,681
Other income (expense)
Interest expense, net	9,649	(2,898)	28,481	(15,688)
Share of affiliates' income	(4,402)	(25,028)	(24,548)	(17,272)
Loss on extinguishment of debt	0		0
Miscellaneous, net	385	(1,291)	173	44,421
Total other income (expense)	5,632	(29,217)	4,106	11,461
Income from operations before income taxes	112,379	122,320	505,343	529,142
Income tax expense	(2,278)	(2,450)	(7,062)	(7,000)
Net income including noncontrolling interests	110,101	119,870	498,281	522,142
Net income attributable to noncontrolling interests	0	0	0	0
Net Income (Loss) Attributable to Parent	110,101	119,870	498,281	522,142
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	152,007	137,704	473,809	404,116
Operating expenses
Technical and operating (excluding depreciation and amortization)	87,891	72,366	251,773	208,388
Selling, general and administrative	41,077	43,727	135,083	124,637
Restructuring expense	548	2,401	860	5,039
Depreciation and amortization	12,317	11,518	33,475	34,915
Total operating expenses	141,833	130,012	421,191	372,979
Operating income	10,174	7,692	52,618	31,137
Other income (expense)
Interest expense, net	(9,603)	(9,275)	(29,055)	(20,477)
Share of affiliates' income	0	0	0	0
Loss on extinguishment of debt	0		0
Miscellaneous, net	2,942	(8,017)	(22,437)	(231)
Total other income (expense)	(6,661)	(17,292)	(51,492)	(20,708)
Income from operations before income taxes	3,513	(9,600)	1,126	10,429
Income tax expense	(5,839)	(11,298)	(10,766)	(13,382)
Net income including noncontrolling interests	(2,326)	(20,898)	(9,640)	(2,953)
Net income attributable to noncontrolling interests	(2,076)	(4,130)	(14,908)	(14,319)
Net Income (Loss) Attributable to Parent	$ (4,402)	$ (25,028)	$ (24,548)	$ (17,272)