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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of exercisable options, out of the money (less than 0.1 million)     0.1    
Vested or expected to vest (in shares)     0.3    
Vested or expected to vest, weighted average exercise price (in dollars per share)     $ 23.00    
Vested or expected to vest, aggregate intrinsic value     $ 200    
Vested or expected to vest, weighted average remaining contractual life     6 years 6 months 29 days    
Expected life     7 years    
Compensation cost for awards     $ 4,096 $ 4,467  
Equity Based Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs     $ 4,100    
Unrecognized compensation costs, period for recognition     1 year 9 months    
Compensation cost for awards     $ 3,490 2,863  
Liability Based Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based liabilities paid     1,000 100  
Unrecognized compensation costs     $ 1,300    
Unrecognized compensation costs, period for recognition     1 year 8 months 9 days    
Compensation cost for awards     $ 606 1,604  
Non-Qualified Stock Options (NQO)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration from the date of grant     10 years    
Stock price (in dollars per share)     $ 21.58    
Options exercised in period, intrinsic value     $ 100 $ 1,400 $ 1,600
Expected life     7 years 7 years 7 years
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSU's vested in period, fair value     $ 3,300 $ 4,500 $ 3,400
Key Employees | Total Shareholder Return Awards (TSR)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Aggregate award target value     $ 2,200 1,500 1,500
Compensation cost for awards     300 1,000 $ 600
Cash paid to settle awards   $ 600      
Compensation and other employee benefits non-current     $ 1,500 $ 1,900  
Key Employees | Minimum | Total Shareholder Return Awards (TSR)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shareholder return award target     0.00%    
Key Employees | Maximum | Total Shareholder Return Awards (TSR)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shareholder return award target     200.00%    
2014 Omnibus Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of Company's common stock authorized for issuance (in shares)     2.6    
Shares available (in shares)     1.1    
Share-based Compensation Award, Tranche One | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increments     33.33%    
Share-based Compensation Award, Tranche One | Capital lease obligations | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increments     33.33%    
Share-based Compensation Award, Tranche Two | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increments     33.33%    
Share-based Compensation Award, Tranche Two | Capital lease obligations | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increments     33.33%    
Share-based Compensation Award, Tranche Three | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increments     33.33%    
Share-based Compensation Award, Tranche Three | Capital lease obligations | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting increments     33.33%    
Subsequent event | Key Employees | Total Shareholder Return Awards (TSR)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash paid to settle awards $ 500