Leases - Operating Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Right-of-use assets obtained in exchange for new operating lease obligations	$ 655	$ 110,252
Right-of-use assets obtained in exchange for new finance lease obligations	2,933	2,933
Operating leases - operating cash flows	2,672	6,861
Finance leases - operating cash flows	241	415
Finance leases - financing cash flows	$ 547	$ 965
Operating leases, weighted-average remaining lease term (in years)	7 years 10 months 24 days	7 years 10 months 24 days
Finance leases, weighted-average remaining lease term (in years)	3 years 6 months	3 years 6 months
Operating leases, weighted-average discount rate (percent)	5.40%	5.40%
Finance leases, weighted-average discount rate (percent)	4.70%	4.70%