Lease Costs and Other Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 2,050
Variable lease cost	760
Total Lease Cost	2,810
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	2,044
Operating lease - operating cash flows - reduction of lease liability	$ 1,598