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Income Taxes Schedule of Income Tax (Expense), Intraperiod Allocation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Results of operations	$ 1,943	$ 1,461	$ 5,997	$ 6,953	$ 5,469	$ 5,250	$ 1,039	$ (2,102)	$ 16,354	$ 9,656	$ (14,297)
Stockholders' equity									449	254	1,332
Income tax expense (benefit)									$ 16,803	$ 9,910	$ (12,965)

- Definition

The sum of the tax effects of all items occurring during the period that have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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