Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Unrealized Gain on Derivative Instruments	$ 2,296	$ 0
Liabilities
Contingent consideration	9,241	10,836
Level 1
Assets
Unrealized Gain on Derivative Instruments	0	0
Liabilities
Contingent consideration	0	0
Level 2
Assets
Unrealized Gain on Derivative Instruments	2,296	0
Liabilities
Contingent consideration	0	0
Level 3
Assets
Unrealized Gain on Derivative Instruments	0	0
Liabilities
Contingent consideration	$ 9,241	$ 10,836