Leases - Narrative (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2019	Jun. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
Lessee, Lease, Description [Line Items]
Total right of use assets, net		$ 50,460	$ 0
Lease liabilities		53,625
Cumulative effect of new accounting principle in period of adoption				$ 482
Property and equipment, net		36,466	$ 82,933
Operating lease, impairment loss	$ 500
Retained Earnings
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption				482
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Total right of use assets, net	39,400	$ 50,460
Lease liabilities	41,500
Lease, right-of-use assets (liabilities), net	2,100
Cumulative effect of new accounting principle in period of adoption	159			153
Property and equipment, net	1,000
Operating lease, impairment loss	500
Deferred income tax assets, net	300
Accounting Standards Update 2016-02 | Retained Earnings
Lessee, Lease, Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 159			$ 153
Minimum
Lessee, Lease, Description [Line Items]
Lessee, lease, term of contract		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, lease, term of contract		10 years