Condensed Consolidated Statements of Equity (USD $) In Thousands, except Share data	Common Stock [Member] Deferred Compensation Plan [Member]	Common Stock [Member] USD ($)	Additional Paid-In Capital [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Retained Earnings [Member] USD ($)	Noncontrolling Interests [Member] USD ($)	Total USD ($)
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)		493,623
Vesting of restricted stock units		5	(5)
Tax withholdings related to net share settlements of restricted stock units		(2)	(6,669)				(6,671)
Tax withholdings related to net share settlements of restricted stock units, shares		(156,902)
Equity-based compensation			4,169				4,169
Exercise of stock options and warrants			529				529
Exercise of stock options and warrants, shares		46,963
Excess tax benefit associated with equity-based compensation			5,060				5,060
Repurchase of common stock (shares)							0
Cash dividends on common stock					(14,242)		(14,242)
Amounts reclassified into earnings, net of taxes				459			459
Changes in fair value of cash flow hedges, net of taxes				(354)			(354)
Distributions to noncontrolling interests						(371)	(371)
Net income					49,015	208	49,223
Ending Balances at Mar. 31, 2014		1,239	799,169	(1,764)	1,282,403	4,962	2,086,009
Ending Balances, Shares at Mar. 31, 2014		123,950,171
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	422,902
Vesting of restricted stock units		4	(4)
Tax withholdings related to net share settlements of restricted stock units		(1)	(6,298)				(6,299)
Tax withholdings related to net share settlements of restricted stock units, shares		(135,531)
Equity-based compensation			4,821				4,821
Exercise of stock options and warrants, shares		6,901
Excess tax benefit associated with equity-based compensation			1,479				1,479
Repurchase of common stock (shares)		(428,669)					(428,669)
Repurchase of common stock		(4)	(18,362)				(18,366)
Cash dividends on common stock					(16,156)		(16,156)
Amounts reclassified into earnings, net of taxes				1,017			1,017
Changes in fair value of cash flow hedges, net of taxes				(3,692)			(3,692)
Distributions to noncontrolling interests						(43)	(43)
Net income					51,824	257	52,081
Ending Balances at Mar. 31, 2015		$ 1,239	$ 792,925	$ (8,268)	$ 1,456,917	$ 5,770	$ 2,248,583
Ending Balances, Shares at Mar. 31, 2015		123,863,782					123,863,782