Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liabilities
Derivative liabilities	$ 1,100
Recurring
Assets
Unrealized gain on derivative instruments	0	$ 930
Liabilities
Contingent consideration	7,302	12,545
Derivative liabilities	1,108	0
Recurring | Level 1
Assets
Unrealized gain on derivative instruments	0	0
Liabilities
Contingent consideration	0	0
Derivative liabilities	0	0
Recurring | Level 2
Assets
Unrealized gain on derivative instruments	0	930
Liabilities
Contingent consideration	0	0
Derivative liabilities	1,108	0
Recurring | Level 3
Assets
Unrealized gain on derivative instruments	0	0
Liabilities
Contingent consideration	7,302	12,545
Derivative liabilities	$ 0	$ 0