Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Net income (loss) - numerator
Net (loss) income	$ (15,505)	$ 3,801
Less dividends to Class B shareholders - distributed earnings		(28)
Undistributed (loss) earnings	$ (15,505)	$ 3,773
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share	55,272	50,016
Weighted average common shares outstanding - Diluted	55,272	50,085
Class A [Member]
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share	55,272	49,597
Dilutive effect of options and restricted stock units		69
Weighted average common shares outstanding - Diluted	55,272	49,666
Basic
Distributed earnings
Undistributed (loss) earnings	$ (0.28)	$ 0.08
Total	$ (0.28)	$ 0.08
Diluted
Distributed earnings
Undistributed (loss) earnings	$ (0.28)	$ 0.08
Total	$ (0.28)	$ 0.08
Class B [Member]
Weighted average common shares outstanding - denominator
Weighted average common shares outstanding for basic earnings (loss) per share		419
Weighted average common shares outstanding - Diluted		419
Basic
Distributed earnings		$ 0.07
Undistributed (loss) earnings		$ 0.08
Total		$ 0.15
Diluted
Distributed earnings		$ 0.07
Undistributed (loss) earnings		$ 0.08
Total		$ 0.15

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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