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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of unrecognized income tax benefits      
Unrecognized tax benefits, beginning balance $ 37,816 $ 30,390 $ 28,420
Additions for tax positions of current year 7,382 7,610 6,388
Additions for tax positions of prior years 1,783 883 1,858
Reduction for tax positions of prior years (1,434) (399) (467)
Reductions for settlements of tax positions (1,225) (312) (1,337)
Reductions for lapses in statutes of limitations (5,448) (356) (4,472)
Unrecognized tax benefits, ending balance 38,874 37,816 30,390
Effect of unrecognized tax benefit on income tax expense $ 25,600 $ 24,600 $ 19,800