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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Total Short-Term Debt $ 37,055   $ 13,524 $ 0 $ 1,667
Long-Term Debt 55,000        
Less Unamortized Debt Issuance Costs (561)   (15,258) (1,195) 0
Total Long-Term Debt 54,439   110,392 151,104 80,391
Debt issuance costs 900   17,200 1,500 200
Term Loan          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Long-Term Debt 0   0 0 2,361
Term Loan | TPG Term Loan          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Long-Term Debt 0   70,650 0 0
Debt issuance costs 400 $ 400 400    
Wells Fargo Revolving Credit Facility          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Long-Term Debt 0   0 97,299 78,030
Unsecured Senior Notes          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Long-Term Debt 55,000   55,000 55,000 0
Term Loan | Wells Fargo Credit Agreement          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Total Short-Term Debt 0   0 0 1,667
Term Loan | TPG Term Loan          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Total Short-Term Debt 0   750 0 0
Wells Fargo Revolving Credit Facility          
Schedule Of Long Term Debt And Short Term Debt Instruments [Line Items]          
Total Short-Term Debt $ 37,055   $ 12,774 $ 0 $ 0