Leases (Supplemental Balance Sheet Information Related to Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases, Operating [Abstract]
Operating lease right-of-use assets	$ 34,099	$ 39,100	$ 0
Operating lease liabilities - current	6,901		0
Operating lease liabilities - long-term	41,932		$ 0
Total operating lease liabilities	$ 48,833	$ 55,800