Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details)

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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits that would affect the effective tax rate $ 9,147,000 $ 6,892,000 $ 7,723,000
Balance at beginning of period 10,512,000 9,998,000 11,187,000
Increases related to prior year tax positions 490,000 858,000 2,514,000
Decreases related to prior year tax positions (1,093,000) (2,895,000) (5,119,000)
Increases related to current year tax positions 1,818,000 2,714,000 1,599,000
Expiration of statute of limitations (982,000) (163,000) (183,000)
Balance at end of period $ 11,064,000 $ 10,512,000 $ 9,998,000