Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
2019	$ 23,955
2020	20,716
2021	18,895
2022	15,974
2023	13,562
Thereafter	36,791
Amortizable intangible assets, net carrying amount	129,893	$ 142,021
Cost of Revenue
Finite Lived Intangible Assets [Line Items]
2019	9,222
2020	8,321
2021	7,406
2022	6,308
2023	5,409
Thereafter	10,745
Amortizable intangible assets, net carrying amount	47,411
Operating Expenses
Finite Lived Intangible Assets [Line Items]
2019	14,733
2020	12,395
2021	11,489
2022	9,666
2023	8,153
Thereafter	26,046
Amortizable intangible assets, net carrying amount	$ 82,482