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Summary of Significant Accounting Policies (Adoption Of New Lease Standard) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating right-of-use assets	$ 41,210	$ 42,472
Property and equipment, net	28,406	27,136	$ 27,339
Current capital lease obligations		2,260	2,421
Current restructuring accrual	2,571	4,771	5,479
Current deferred rent			1,884
Current operating lease liabilities	6,629	7,846
Non-current restructuring accrual		0	1,810
Non-current deferred rent			10,304
Non-current capital lease obligations		1,185	1,182
Non-current operating lease liabilities	47,739	49,333
Stockholders' equity	$ 533,938	551,521	$ 551,567	$ 548,743	$ 656,492
New lease standard adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating right-of-use assets		42,472
Property and equipment, net		(203)
Current capital lease obligations		(161)
Current restructuring accrual		(708)
Current deferred rent		(1,884)
Current operating lease liabilities		7,846
Non-current restructuring accrual		(1,810)
Non-current deferred rent		(10,304)
Non-current capital lease obligations		3
Non-current operating lease liabilities		49,333
Stockholders' equity		$ (46)

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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