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, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits that would affect the effective tax rate $ 13,600,000 $ 11,500,000 $ 9,100,000
Balance at beginning of period 12,478,000 11,064,000 10,512,000
Increases related to prior year tax positions 1,903,000 4,374,000 490,000
Decreases related to prior year tax positions (162,000) (5,423,000) (1,093,000)
Increases related to current year tax positions 906,000 4,991,000 1,818,000
Expiration of statute of limitations (632,000) (1,064,000) (982,000)
Balance at end of period $ 14,493,000 $ 12,478,000 $ 11,064,000