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]	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)		497,586
Vesting of restricted stock units		$ 5	(5)
Tax withholdings related to net share settlements of restricted stock units		$ (2)	(6,727)				(6,729)
Tax withholdings related to net share settlements of restricted stock units, shares		(158,182)
Equity-based compensation			9,444				9,444
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			7,096				$ 7,096
Repurchase of common stock (shares)							0
Cash dividends on common stock					(28,496)		$ (28,496)
Amounts reclassified into earnings, net of taxes				818			818
Changes in fair value of cash flow hedges, net of taxes				(1,429)			(1,429)
Distributions to noncontrolling interests						(371)	(371)
Net income					111,679	443	112,122
Ending Balances at Jun. 30, 2014		$ 1,241	808,849	(2,480)	1,330,813	5,197	2,143,620
Ending Balances, Shares at Jun. 30, 2014		124,116,793
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	426,864
Vesting of restricted stock units		$ 4	(4)
Tax withholdings related to net share settlements of restricted stock units		$ (1)	(6,358)				$ (6,359)
Tax withholdings related to net share settlements of restricted stock units, shares		(136,781)
Equity-based compensation			9,580				9,580
Exercise of stock options and warrants			417				417
Exercise of stock options and warrants, shares		35,205
Excess tax benefit associated with equity-based compensation			1,850				$ 1,850
Repurchase of common stock (shares)		(903,769)					(903,769)
Repurchase of common stock		$ (9)	(41,302)				$ (41,311)
Cash dividends on common stock					(32,203)		(32,203)
Amounts reclassified into earnings, net of taxes				2,074			2,074
Changes in fair value of cash flow hedges, net of taxes				(4,078)			(4,078)
Distributions to noncontrolling interests						(43)	(43)
Net income					109,184	539	109,723
Ending Balances at Jun. 30, 2015		$ 1,234	$ 775,472	$ (7,597)	$ 1,498,230	$ 6,052	$ 2,273,391
Ending Balances, Shares at Jun. 30, 2015		123,419,698					123,419,698