Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases
Operating lease ROU assets	$ 31,876
Financial position	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities - current	$ 13,797
Financial position	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities - noncurrent	$ 18,826
Financial position	us-gaap:OtherLiabilitiesNoncurrent
Total Operating lease liabilities	$ 32,623
Financing Lease ROU assets	$ 473
Financial position	Property, Plant and Equipment, Net
Finance lease liabilities - current	$ 290
Financial position	us-gaap:OtherLiabilitiesCurrent
Finance lease liabilities - noncurrent	$ 198
Financial position	us-gaap:OtherLiabilitiesNoncurrent
Finance lease liabilities	$ 488
Weighted average remaining lease term - Operating leases	4 years
Weighted average remaining lease term - Financing leases	2 years
Weighted average discount rate - Operating leases	4.33%
Weighted average discount rate - Financing leases	6.00%
Finance lease assets
Leases
Property and equipment, gross	$ 1,255
Accumulated depreciation	$ (782)