Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Unrealized gain on derivative instruments	$ 1,928	$ 2,296
Liabilities
Contingent consideration	16,166	9,241
Level 1
Assets
Unrealized gain on derivative instruments	0	0
Liabilities
Contingent consideration	0	0
Level 2
Assets
Unrealized gain on derivative instruments	1,928	2,296
Liabilities
Contingent consideration	0	0
Level 3
Assets
Unrealized gain on derivative instruments	0	0
Liabilities
Contingent consideration	$ 16,166	$ 9,241