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Income Taxes (Details 4) (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 $ 62,247 $ 61,236 $ 69,494
Additions based on tax positions related to the current year 3,980 3,776 4,233
Settlements 0 0 (8,280)
Reductions due to lapse of applicable statute of limitations (13,956) (2,765) (4,211)
Gross balance at December 31 52,271 62,247 61,236
Interest and penalties 5,319 6,933 5,858
Balance at December 31 $ 57,590 $ 69,180 $ 67,094