Operating Expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Amortization expense	$ 37,593	$ 24,357	$ 9,878
Depreciation expense	29,021	28,337	30,983
Software [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	18,996	11,662	7,218
Depreciation expense	$ 494	$ 1,207	$ 2,880