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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property and Equipment          
Property and equipment $ 190,203   $ 190,203   $ 176,946
Less accumulated depreciation (121,853)   (121,853)   (100,758)
Property and equipment, net 68,350   68,350   76,188
Depreciation expense 10,500 $ 9,900 21,100 $ 19,400  
Capitalized amount 5,800 6,200 12,300 15,800  
Amortization expense 7,500 $ 6,000 14,800 $ 11,400  
Internal use software 45,900   45,900   48,500
Computer equipment and software          
Property and Equipment          
Property and equipment 161,294   161,294   148,104
Furniture and fixtures          
Property and Equipment          
Property and equipment 10,089   10,089   10,020
Leasehold improvements          
Property and Equipment          
Property and equipment $ 18,820   $ 18,820   $ 18,822