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Income Taxes Schedule of Unrecognized Tax Benefits Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1 $ 5,497 $ 5,441 $ 8,526
Additions based on tax positions related to the current year 973 952 713
Additions for tax positions of prior years 167 192 281
Reductions for tax positions of prior years (2,379)   (86)
Reductions for tax positions of prior years—timing differences     (2,041)
Lapse of statutes of limitations (998) (892) (1,952)
Settlements with taxing authorities (957) (196)  
Balance at December 31 $ 2,303 $ 5,497 $ 5,441