Commitments And Contingencies (Future Minimum Payments Under Operating Leases) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total Minimum Payments, 2017	$ 59,014
Total Minimum Payments, 2018	58,772
Total Minimum Payments, 2019	43,836
Total Minimum Payments, 2020	38,570
Total Minimum Payments, 2021	28,386
Total Minimum Payments, Years subsequent to 2021	31,267
Non-cancelable Subleases, 2017	17,345
Non-cancelable Subleases, 2018	17,345
Non-cancelable Subleases, 2012	17,345
Non-cancelable Subleases, 2020	17,392
Non-cancelable Subleases, 2021	17,345
Non-cancelable Subleases, Years subsequent to 2021	24,045
Net Minimum Payments, 2017	41,669
Net Minimum Payments, 2018	41,427
Net Minimum Payments, 2019	26,491
Net Minimum Payments, 2020	21,178
Net Minimum Payments, 2021	11,041
Net Minimum Payments, Years subsequent to 2021	$ 7,222