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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)