Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Beginning Balance at Dec. 31, 2011	$ 577,826	$ 484	$ 335,337	$ 144,424	$ 7,173	$ 90,408
Shares, Outstanding, Beginning Balance at Dec. 31, 2011		48,432,860
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	77,999			64,794		13,205
Other Comprehensive Income (Loss), Net of Tax	16,368				18,843	(2,475)
Performance Units Vested		5,057
Minimum Tax Withholding Settlement	(114)		(114)
Compensation	64		64
Noncontrolling Interest Distribution	(2,974)					(2,974)
Dividends, Common Stock, Cash	(16,953)			(16,953)
Stockholders' Equity, Ending Balance at Mar. 31, 2012	$ 652,216	$ 484	$ 335,287	$ 192,265	$ 26,016	$ 98,164
Shares, Outstanding, Ending Balance at Mar. 31, 2012		48,437,917