Leases - Cash Flow and Supplemental Noncash Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash payments for operating leases	$ 11,200
Operating cash payments for finance leases	1,535
Financing cash payments for finance leases	7,826
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	623
Finance leases	$ 5,901