Lease Agreements - (Textual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leased Assets [Line Items]
Build to suit liability	$ 12,305	$ 13,237
Operating Leases, Rent Expense	9,175	11,812	$ 12,037
Lease Extrication Charges from Restructuring Activities	12,942	9,008	(2,960)
Gross Value Capital Leased Assets	524	2,109
Contract Termination [Member]
Operating Leased Assets [Line Items]
Lease Extrication Charges from Restructuring Activities	$ 6,038	$ 444	$ 186