Condensed Consolidating Financial Statements (Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Income Statements, Captions [Line Items]
Revenues, net	$ 720,189	$ 706,579
Operating expenses
Technical and operating (excluding depreciation and amortization)	298,612	274,274
Selling, general and administrative	163,709	153,901
Restructuring expense (credit)	2,704	(35)
Depreciation and amortization	23,493	19,632
Total operating expenses	488,518	447,772
Operating income	231,671	258,807
Other income (expense)
Interest expense, net	(27,007)	(31,029)
Share of affiliates' income	0	0
Loss on extinguishment of debt	0	(48,334)
Miscellaneous, net	11,049	(837)
Nonoperating Income (Expense)	(15,958)	(80,200)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	215,713	178,607
Income tax expense	(73,082)	(58,543)
Net income including noncontrolling interests	142,631	120,064
Net Income (Loss) Attributable to Noncontrolling Interest	(6,414)	(6,620)
Net Income (Loss) Attributable to Parent	136,217	113,444
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	(2,325)	(2,484)
Operating expenses
Technical and operating (excluding depreciation and amortization)	(759)	(683)
Selling, general and administrative	(1,451)	(1,804)
Restructuring expense (credit)	0	0
Depreciation and amortization	0	0
Total operating expenses	(2,210)	(2,487)
Operating income	(115)	3
Other income (expense)
Interest expense, net	0	0
Share of affiliates' income	(238,919)	(245,277)
Loss on extinguishment of debt		0
Miscellaneous, net	115	(3)
Nonoperating Income (Expense)	(238,804)	(245,280)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(238,919)	(245,277)
Income tax expense	0	0
Net income including noncontrolling interests	(238,919)	(245,277)
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net Income (Loss) Attributable to Parent	(238,919)	(245,277)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	0	0
Operating expenses
Technical and operating (excluding depreciation and amortization)	0	0
Selling, general and administrative	0	0
Restructuring expense (credit)	0	0
Depreciation and amortization	0	0
Total operating expenses	0	0
Operating income	0	0
Other income (expense)
Interest expense, net	(29,412)	(30,572)
Share of affiliates' income	235,774	246,047
Loss on extinguishment of debt		(48,334)
Miscellaneous, net	(112)	(79)
Nonoperating Income (Expense)	206,250	167,062
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	206,250	167,062
Income tax expense	(70,033)	(53,618)
Net income including noncontrolling interests	136,217	113,444
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net Income (Loss) Attributable to Parent	136,217	113,444
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	579,382	554,326
Operating expenses
Technical and operating (excluding depreciation and amortization)	221,754	190,110
Selling, general and administrative	119,681	114,357
Restructuring expense (credit)	2,704	(70)
Depreciation and amortization	10,204	10,075
Total operating expenses	354,343	314,472
Operating income	225,039	239,854
Other income (expense)
Interest expense, net	9,823	9,293
Share of affiliates' income	3,145	(770)
Loss on extinguishment of debt		0
Miscellaneous, net	431	(21)
Nonoperating Income (Expense)	13,399	8,502
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	238,438	248,356
Income tax expense	(2,664)	(2,309)
Net income including noncontrolling interests	235,774	246,047
Net Income (Loss) Attributable to Noncontrolling Interest	0	0
Net Income (Loss) Attributable to Parent	235,774	246,047
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues, net	143,132	154,737
Operating expenses
Technical and operating (excluding depreciation and amortization)	77,617	84,847
Selling, general and administrative	45,479	41,348
Restructuring expense (credit)	0	35
Depreciation and amortization	13,289	9,557
Total operating expenses	136,385	135,787
Operating income	6,747	18,950
Other income (expense)
Interest expense, net	(7,418)	(9,750)
Share of affiliates' income	0	0
Loss on extinguishment of debt		0
Miscellaneous, net	10,615	(734)
Nonoperating Income (Expense)	3,197	(10,484)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	9,944	8,466
Income tax expense	(385)	(2,616)
Net income including noncontrolling interests	9,559	5,850
Net Income (Loss) Attributable to Noncontrolling Interest	(6,414)	(6,620)
Net Income (Loss) Attributable to Parent	$ 3,145	$ (770)