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Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Total capitalized software development costs subject to amortization and the related amortization expense      
Gross carrying amount $ 81,007 $ 67,820 $ 58,408
Accumulated amortization (34,210) (25,210) (17,804)
Net carrying amount 46,797 42,610 40,604
Amortization expense 9,000 7,406 6,909
Gross carrying amount, not yet subject to amortization 15,800 $ 10,900 $ 9,200
Estimated future amortization expense related to capitalized software development costs      
2016 9,314    
2017 8,674    
2018 4,906    
2019 3,467    
2020 $ 2,405