Leases - Components of Lease Expense, Weighted-Average Remaining Lease Term and Discount Rate and Other Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Lease cost:
Operating lease cost	$ 4,477
Short-term lease cost	2,678
Sublease income	(91)
Total lease cost	$ 7,064
Weighted Average Remaining Lease Term, Operating leases	4 years 7 months 6 days
Weighted Average Discount Rate, Operating leases	5.45%
Gain on sale and leaseback transactions, net	$ 207
Operating cash flows from operating leases	4,539
Right-of-use lease assets obtained in exchange for lease obligations, Operating leases	$ 3,339