Commitments and Contingencies Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Finance lease ROU asset amortization	$ 63
Finance lease interest expense	209
Total finance lease costs	272
Operating lease costs	2,505
Total lease costs	2,777
Operating cash flows from operating leases	2,280
Operating cash flows from finance leases	209
Operating leases	328
Finance leases	$ 1,326