Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 8,464	$ 10,144
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	24,392
2018	28,844
2019	21,965
2020	14,463
2021	11,760
Thereafter	22,350
Net Carrying Amount	$ 123,774		$ 132,213