Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss) - numerator
Net (loss) income	$ 25,119	$ (6,676)	$ 9,615	$ (2,875)
Less dividends to Class B shareholders - distributed earnings		0	0	(28)
Undistributed (loss) earnings	$ 25,119	$ (6,676)	$ 9,615	$ (2,903)
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share	55,839	55,271	55,729	52,644
Weighted average common shares outstanding - Diluted	55,937	55,271	55,819	52,644
Class A [Member]
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share	55,839	55,271	55,729	52,434
Dilutive effect of options and restricted stock units	98	0	90	0
Weighted average common shares outstanding - Diluted	55,937	55,271	55,819	52,434
Basic
Distributed earnings	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Undistributed (loss) earnings	$ 0.45	$ (0.12)	$ 0.17	$ (0.06)
Total	$ 0.45	$ (0.12)	$ 0.17	$ (0.06)
Diluted
Distributed earnings			$ 0.00
Undistributed (loss) earnings	$ 0.45	$ (0.12)	$ 0.17	$ (0.06)
Total	$ 0.45	$ (0.12)	$ 0.17	$ (0.06)
Class B [Member]
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share	0	0	0	210
Weighted average common shares outstanding - Diluted	0	0	0	210
Basic
Distributed earnings	$ 0.00	$ 0.00	$ 0.00	$ 0.13
Undistributed (loss) earnings	$ 0.00	$ 0.00	$ 0.00	$ (0.06)
Total	$ 0.00	$ 0.00	$ 0.00	$ 0.07
Diluted
Distributed earnings	$ 0.00	$ 0.00	$ 0.00	$ 0.13
Undistributed (loss) earnings	$ 0.00	$ 0.00	$ 0.00	$ (0.06)
Total	$ 0.00	$ 0.00	$ 0.00	$ 0.07

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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