CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ( UNAUDITED ) (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (loss) [Member]	Noncontrolling Interest [Member]	Redeemable Noncontrolling Interest (Temporary Equity) [Member]
Balance at Dec. 31, 2012	$ 2,128,051	$ 1,489	$ 1,405,699	$ 452,598	$ (38,862)	$ 307,127	$ 136,500
Other comprehensive income (loss), net of tax:
Comprehensive income (loss)	118,545			107,819	(28,056)	38,782	4,505
Dividends paid to noncontrolling interest	(89,865)					(89,865)
Dividends: declared and paid	(22,330)			(22,330)
Repurchase of Class A Common shares	(150,048)	(24)	(23,373)	(126,651)
Stock-based compensation expense	16,360		16,360
Exercise of employee stock options	13,074	3	13,071
Other stock-based compensation, net	(4,836)	1	(4,837)
Tax benefits of compensation plans	1,753		1,753
Balance at Mar. 31, 2013	2,010,704	1,469	1,408,673	411,436	(66,918)	256,044	141,005
Balance at Dec. 31, 2013	2,418,892	1,462	1,447,496	662,574	(12,529)	319,889	133,000
Other comprehensive income (loss), net of tax:
Comprehensive income (loss)	172,447			128,296	3,701	40,450	3,920
Dividends paid to noncontrolling interest	(120,270)					(120,270)	(5,250)
Dividends: declared and paid	(29,323)			(29,323)
Repurchase of Class A Common shares	(250,062)	(31)	(32,208)	(217,823)
Stock-based compensation expense	15,083		15,083
Exercise of employee stock options	22,342	6	22,336
Other stock-based compensation, net	(7,717)	2	(7,719)
Tax benefits of compensation plans	7,196		7,196
Balance at Mar. 31, 2014	$ 2,228,588	$ 1,439	$ 1,452,184	$ 543,724	$ (8,828)	$ 240,069	$ 131,670