v3.6.0.2
COMMITMENTS AND CONTINGENCIES - Bank Line of Credit and Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases      
Rent expense incurred relating to operating leases $ 15,856 $ 12,942 $ 10,769
Reduction to occupancy expenses 852 0 $ 0
Sublease loss reserve 1,741    
Future minimum rental payments      
2017 17,124    
2018 16,981    
2019 16,979    
2020 11,106    
2021 5,780    
Thereafter 15,620    
Total 83,590    
Sublease Income Net      
2017 (35)    
2018 (417)    
2019 (591)    
2020 (835)    
2021 (835)    
Thereafter (2,922)    
Total (5,635)    
Minimum Payments      
2017 17,089    
2018 16,564    
2019 16,388    
2020 10,271    
2021 4,945    
Thereafter 12,698    
Total 77,955    
Unsecured revolving credit facility      
Minimum Payments      
Commitment amount $ 40,000    
Fixed rate of interest (as a percent) 3.50%    
Borrowings under the credit facility $ 0 $ 0  
Available credit under the facility $ 33,161    
Unsecured revolving credit facility | LIBOR      
Minimum Payments      
Reference rate (as a percent) LIBOR    
Interest rate margin (as a percent) 1.00%    
Unsecured revolving credit facility | Prime      
Minimum Payments      
Reference rate (as a percent) Prime    
Interest rate margin (as a percent) (1.50%)    
Standby letters of credit      
Minimum Payments      
Letters of credit outstanding $ 6,839    
Fee on the outstanding balances (as a percent) 1.00%