Earnings Per Share (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations Attributable to Parent	$ 73,079		$ 71,057		$ 25,905
Less: earnings allocated to unvested restricted stock(1)	(819)	[1]	(810)	[1]	(500)	[1]
Net earnings from continuing operations allocated to common shares	72,260		70,247		25,405
Net (loss) earnings from discontinued operations allocated to common shares	0		(57)		(804)
Net earnings allocated to common shares	$ 72,260		$ 70,190		$ 24,601
Weighted-average basic shares and unvested restricted stock outstanding	103,035		103,045		45,799
Less: weighted-average unvested restricted stock outstanding	(1,122)		(1,132)		(1,148)
Weighted-average basic shares outstanding	101,913		101,913		44,651
Net earnings from continuing operations	$ 0.71		$ 0.69		$ 0.57
Net loss from discontinued operations	$ 0.00		$ 0.00		$ (0.02)
Basic net income per share	$ 0.71		$ 0.69		$ 0.55
Net earnings allocated to common shares	72,260		70,190		24,601
Net earnings from continuing operations	$ 0.71		$ 0.69		$ 0.57
Net loss from discontinued operations	$ 0.00		$ 0.00		$ (0.02)
Diluted net income per share	$ 0.71		$ 0.69		$ 0.55

[1] Represents cash dividends paid to holders of unvested restricted stock, net of estimated forfeitures, plus undistributed earnings amounts available to holders of unvested restricted stock, if any.