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Stock Based Compensation - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
shares
Mar. 31, 2016
shares
Mar. 31, 2015
shares
Dec. 31, 2016
USD ($)
item
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restricted Stock Share Awards | 2010 Plan            
Additional Employee Stock Plans Informatioin            
Compensation expenses recognized       $ 0 $ 385 $ 891
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest       0 0 0
Performance Share Unit Awards            
Additional Employee Stock Plans Informatioin            
Compensation expenses recognized       1,382 1,247 730
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest       326    
Performance Share Unit Awards | 2010 Plan            
Additional Employee Stock Plans Informatioin            
Compensation expenses recognized       1,516 1,643  
Number of performance shares units that will be converted into RSUs | shares 87,876 71,428 71,981      
Restricted Stock Unit Awards            
Additional Employee Stock Plans Informatioin            
Vesting period of awards   2 years        
Restricted Stock Unit Awards | 2010 Plan            
Additional Employee Stock Plans Informatioin            
Compensation expenses recognized           $ 1,247
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest       $ 454    
Minimum age of employee, attaining which awards are continued to be vested upon retirement | item       65    
Minimum service period, upon serving which awards are continued to be vested upon retirement       10 years    
Minimum age of employee along with service period condition, attaining which awards are continued to be vested upon retirement | item       55    
Maximum period following a termination of service in which the share-based award will be settled       2 months 15 days    
Percentage of RSUs issued that will immediately vest and be converted into common shares   33.33%        
Percentage of RSUs issued that will vest ratably over the remaining vesting period   66.67%        
Restricted Stock Unit Awards | 2010 Plan | Management            
Additional Employee Stock Plans Informatioin            
Accelerated stock based compensation expense       $ 528 $ 303  
Restricted Stock Unit Awards | 2010 Plan | Common Stock            
Additional Employee Stock Plans Informatioin            
Number of shares issued upon exercise of units other than options | shares       1