Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Common Stock [Member] Deferred Compensation Plan [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]	Total
Beginning Balances at Dec. 31, 2013		$ 1,236	$ 796,085	$ (1,869)		$ 1,247,630	$ 5,125	$ 2,048,207
Beginning Balances, shares at Dec. 31, 2013		123,566,487
Vesting of restricted stock units (shares)		501,857
Vesting of restricted stock units		$ 5	(5)
Tax withholdings related to net share settlements of restricted stock units		$ (2)	(6,794)					(6,796)
Tax withholdings related to net share settlements of restricted stock units, shares		(159,534)
Equity-based compensation			13,889					13,889
Exercise of stock options and warrants		$ 2	2,956					2,958
Exercise of stock options and warrants, shares		210,902
Excess tax benefit associated with equity-based compensation			7,177					$ 7,177
Repurchase of common stock (shares)								0
Cash dividends on common stock						(42,770)		$ (42,770)
Amounts reclassified into earnings, net of taxes				1,496				1,496
Changes in fair value of cash flow hedges, net of taxes				(1,567)				(1,567)
Distributions to noncontrolling interests							(371)	(371)
Net income (loss)						171,763	644	172,407
Ending Balances at Sep. 30, 2014		$ 1,241	813,308	(1,940)		1,376,623	5,398	2,194,630
Ending Balances, shares at Sep. 30, 2014		124,119,712
Beginning Balances at Dec. 31, 2014		$ 1,240	811,289	(5,593)		1,421,249	5,556	$ 2,233,741
Beginning Balances, shares at Dec. 31, 2014		123,984,527						123,984,527
Vesting of restricted stock units (shares)	13,652	432,165
Vesting of restricted stock units		$ 4	(4)
Tax withholdings related to net share settlements of restricted stock units		$ (1)	(6,440)					$ (6,441)
Tax withholdings related to net share settlements of restricted stock units, shares		(138,493)
Equity-based compensation			14,433					14,433
Exercise of stock options and warrants			494					494
Exercise of stock options and warrants, shares		40,205
Excess tax benefit associated with equity-based compensation			1,986					$ 1,986
Repurchase of common stock (shares)					1,050,820			1,050,820
Repurchase of common stock (shares)		(912,169)						(1,962,989)
Repurchase of common stock					$ (49,458)
Repurchase of common stock		$ (9)	(41,698)					$ (91,165)
Cash dividends on common stock						(48,246)		(48,246)
Amounts reclassified into earnings, net of taxes				3,270				3,270
Changes in fair value of cash flow hedges, net of taxes				(10,913)				(10,913)
Distributions to noncontrolling interests							(43)	(43)
Net income (loss)						(147,825)	743	(147,082)
Ending Balances at Sep. 30, 2015		$ 1,234	$ 780,060	$ (13,236)	$ (49,458)	$ 1,225,178	$ 6,256	$ 1,950,034
Ending Balances, shares at Sep. 30, 2015		123,419,887						123,419,887
Ending Balance, treasury shares at Sep. 30, 2015					1,050,820			1,050,820