Income Taxes - Narrative (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 Contingency [Line Items]
Income tax expense	$ 11,753	$ 11,308	$ 15,426	$ 20,778
Tax benefit from change in tax accounting method	9,100
Unrecognized tax benefit	19,900		19,900
Net tax benefit from unrecognized tax benefits, if recognized	13,000		13,000
Cash and cash equivalents	168,565		$ 168,565		$ 157,418
Costa Rica | Tax holiday through December 31, 2018
Income Tax Contingency [Line Items]
Holiday tax rate			100.00%
International
Income Tax Contingency [Line Items]
Cash and cash equivalents	$ 139,300		$ 139,300