Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 39,628	$ 34,467	$ 22,130
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	32,982
2018	28,859
2019	21,976
2020	14,468
2021	11,759
Thereafter	22,169
Net Carrying Amount	$ 132,213	$ 172,295