Goodwill and Intangible Assets Goodwill and Intangible Assets - Amortization Expense for Intangible Assets (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
2019	$ 21,094
2020	18,193
2021	15,477
2022	14,015
2023	13,794
thereafter	61,816
Total	144,389
Amount Reflected as Rent Expense
Finite-Lived Intangible Assets [Line Items]
2019	991
2020	965
2021	953
2022	935
2023	924
thereafter	9,056
Total	13,824
Amount Reflected as Amortization Expense
Finite-Lived Intangible Assets [Line Items]
2019	20,103
2020	17,228
2021	14,524
2022	13,080
2023	12,870
thereafter	52,760
Total	$ 130,565