Income Tax Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net interest and penalties expense	$ (42)	$ 315	$ 259	$ 739
Accrued interest	2,383		2,383		$ 2,127
Accrued penalties	1,774		1,774		1,758
Unrecognized tax benefits related to uncertain tax positions	115,282		115,282		112,558
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	$ 113,952		$ 113,952		$ 111,224