CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ( UNAUDITED ) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (loss) [Member]	Noncontrolling Interest [Member]
Total Equity Balance at Dec. 31, 2013	$ 2,418,892	$ 1,462	$ 1,447,496	$ 662,574	$ (12,529)	$ 319,889
Comprehensive income (loss)	528,670			413,429	(11,539)	126,780
Dividends paid to non-controlling interest	(172,928)					(172,928)
Dividends: declared and paid	(85,364)			(85,364)
Repurchase of Class A Common shares	(800,062)	(103)	(109,103)	(690,856)
Share-based compensation	29,658		29,658
Exercise of employee share options	35,118	9	35,109
Other share-based compensation, net: 443,956 shares issued; 151,526 shares repurchased	(9,768)	3	(9,771)
Tax benefits of compensation plans	11,442		11,442
Total Equity Balance at Sep. 30, 2014	1,955,658	1,371	1,404,831	299,783	(24,068)	273,741
Redeemable Non-controlling Interests (Temporary Equity) Balance at Dec. 31, 2013	133,000
Comprehensive income	8,388
Dividends paid to non-controlling interest	(21,928)
Redeemable Non-controlling Interests (Temporary Equity) Balance at Sep. 30, 2014	119,460
Total Equity Balance at Sep. 30, 2014	1,955,658	1,371	1,404,831	299,783	(24,068)	273,741
Redeemable Non-controlling Interests (Temporary Equity) Balance at Sep. 30, 2014	119,460
Total Equity Balance at Dec. 31, 2014	1,684,587	1,321	1,359,023	79,994	(57,891)	302,140
Comprehensive income (loss)	568,359			442,120	(4,841)	131,080
Dividends paid to non-controlling interest	(145,052)					(145,052)
Additions to noncontrolling interest	858,530					858,530
Redeemable noncontrolling interests fair value adjustments	(1,081)			(1,081)
Dividends: declared and paid	(89,144)			(89,144)
Repurchase of Class A Common shares	(288,502)	(40)	(43,677)	(244,785)
Share-based compensation	29,443		29,443
Exercise of employee share options	8,073	2	8,071
Other share-based compensation, net: 443,956 shares issued; 151,526 shares repurchased	(7,141)	3	(7,144)
Tax benefits of compensation plans	622		622
Total Equity Balance at Sep. 30, 2015	1,764,841	1,286	1,354,294	187,104	(62,732)	284,889
Purchase of non-controlling interest	(853,853)		7,956			(861,809)
Redeemable Non-controlling Interests (Temporary Equity) Balance at Dec. 31, 2014	96,251
Comprehensive income	5,042
Dividends paid to non-controlling interest	(9,896)
Dividends: declared and paid - $0.60 per share	700
Repurchases of class A common shares: 10,302,935	1,081
Redeemable Non-controlling Interests (Temporary Equity) Balance at Sep. 30, 2015	93,178
Total Equity Balance at Sep. 30, 2015	1,764,841	$ 1,286	$ 1,354,294	$ 187,104	$ (62,732)	$ 284,889
Redeemable Non-controlling Interests (Temporary Equity) Balance at Sep. 30, 2015	$ 93,178