Leases (Supplemental balance sheet information related to leases) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lease Assets and Liabilities
Total operating lease liabilities	$ 20,887
Weighted-average remaining lease term (years)	5 years 6 months 29 days
Weighted-average discount rate	15.25%
Other Noncurrent Assets [Member]
Lease Assets and Liabilities
Operating lease ROU assets	$ 11,049
Other Current Liabilities [Member]
Lease Assets and Liabilities
Current operating lease liabilities	3,491
Other Noncurrent Liabilities [Member]
Lease Assets and Liabilities
Non-current operating lease liabilities	$ 17,396