Commitments And Contingencies (Summary Of Minimum Future Rental Payments Required Under Operating Leases and Capital Leases) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Capital Leases
2017	$ 8,591
2018	7,269
2019	7,368
2020	7,360
2021	7,542
Thereafter	24,178
Total minimum lease payments	62,308
Less: Amount representing interest	5,332
Total present value of minimum payments	56,976
Less: Current portion of such obligations	8,591
Long-term capital lease obligations	48,385
Future minimum sublease rentals	20,000
Operating Leases
2017	17,531
2018	16,295
2019	14,158
2020	11,923
2021	9,386
Thereafter	22,295
Total minimum lease payments	$ 91,588