Consolidated Statements of Shareholder's Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Common Stock, Shares, Outstanding		75,454,511
Stockholders' Equity Attributable to Parent	$ 2,008,681	$ 754	$ 1,468,779	$ 539,332	$ (184)
Stock Issued During Period, Shares, New Issues		255,880
Stock Issued During Period, Value, New Issues	0	$ 3	(3)
Stock Repurchased During Period, Shares		(644,045)
Stock Repurchased During Period, Value	(11,424)	$ (6)	(11,418)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,425		1,425
Dividends, Common Stock, Cash	(22,511)			(22,511)
Net income (loss)	17,512			17,512
Net derivative loss reclassified into earnings	184				(184)
Common Stock, Shares, Outstanding		75,066,346
Stockholders' Equity Attributable to Parent	$ 1,993,867	$ 751	1,458,783	534,333	0
Common Stock, Shares, Outstanding	75,122,129	75,122,129
Stockholders' Equity Attributable to Parent	$ 2,052,684	$ 751	1,446,664	605,269	0
Stock Issued During Period, Shares, New Issues		28,568
Stock Issued During Period, Value, New Issues	0	$ 1	(1)
Stock Repurchased During Period, Shares		(73,903)
Stock Repurchased During Period, Value	(2,370)	$ (1)	(2,369)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	10,678		10,678
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	2,005		2,005
Dividends, Common Stock, Cash	(24,025)			(24,025)
Net income (loss)	3,659			3,659
Net derivative loss reclassified into earnings	$ 0
Common Stock, Shares, Outstanding	75,076,794	75,076,794
Stockholders' Equity Attributable to Parent	$ 2,036,189	$ 751	$ 1,456,977	$ 578,461	$ 0