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Stock-based Compensation - Stock Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock based Compensation      
Total $ 19,284 $ 17,413 $ 14,679
Stock compensation expense for each of the next five years, based on restricted stock awards granted      
2018 17,547    
2019 11,946    
2020 6,315    
2021 1,472    
2022 6    
Included in general and administrative      
Stock based Compensation      
Total 15,706 14,607 11,633
Included in cost of services      
Stock based Compensation      
Total $ 3,578 $ 2,806 $ 3,046