Goodwill and Other Intangible Assets (Estimated Annual Amortization Expense) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization charge of intangible assets	$ 3,800	$ 3,800
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remainder of 2017	4,108
2018	7,852
2019	6,870
2020	5,900
2021	5,504
2022 and thereafter	10,938
Net Carrying Amount	$ 41,172		$ 28,512