Annual report pursuant to Section 13 and 15(d)

Income Taxes - Unrecognized tax benefits (Details)

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Income Taxes - Unrecognized tax benefits (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]    
Balance, beginning of year $ 1,400,000 $ 8,100,000
Additions for prior year tax positions 3,500,000 100,000
Settlements paid to tax authorities 0 0
Reductions of prior year tax positions 0 (6,800,000)
Balance, end of year $ 4,900,000 $ 1,400,000