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Income Taxes - Unrecognized Tax Benefit Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Beginning balance	$ 21,400	$ 9,665	$ 11,998
Additions based on tax positions related to current year	1,893	2,002	271
Additions based on tax positions related to prior years	450	9,887	862
Reductions based on settlement payments to (refunds from) government authorities	(3,461)	(154)	(3,466)
Reductions based on tax positions related to prior years	(20)	0	0
Reductions based on lapse of statute of limitations	(702)	0	0
Ending balance	$ 19,560	$ 21,400	$ 9,665

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Amount of unrecognized tax benefits.

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