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Share-Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
May 21, 2019
Feb. 20, 2018
Dec. 31, 2019
Dec. 31, 2018
Apr. 02, 2019
Stock-Based Compensation Plan            
Share-based compensation expenses       $ 6,148 $ 5,980  
Share-based compensation (capitalized)       $ 500 500  
Shares available for future grant under stock compensation plans 1,066,770     1,066,770    
Employee Savings Plan [Abstract]            
Employee Savings Plan, Employer Matching Contribution, Percent       100.00%    
Employee Savings Plan, Maximum Annual Contribution Per Employee, Percent       6.00%    
Employee Savings Plan, Employer Discretionary Contribution Amount       $ 600    
General and Administrative Expense [Member]            
Stock-Based Compensation Plan            
Share-based compensation expenses       6,100 $ 6,000  
Share-based Payment Arrangement, Option - Equity Exchange Award [Member]            
Stock Option Awards            
Unrecognized compensation cost related to stock awards           $ 1,200
Share-based Payment Arrangement, Option [Member]            
Stock Option Awards            
Unrecognized compensation cost related to stock awards $ 1,200     1,200    
Outstanding stock options aggregate intrinsic value 0     $ 0    
Remaining contract life of outstanding stock options.       5 years 6 months    
Remaining contract life of exercisable stock option       3 years 8 months    
Intrinsic value of exercised stock option       $ 0    
Restricted Stock Units (RSUs) [Member]            
Stock-Based Compensation Plan            
Equity Award Exchange Percentage of Award           50.00%
Stock Option Awards            
Unrecognized compensation cost related to stock awards 4,300     $ 4,300    
Restricted Stock Units [Abstract]            
Weighted average recognition period of cost related to stock awards       1 year 11 months    
Performance Share Units [Abstract]            
Restricted stock units granted       115,957    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 20.13    
Restricted stock units vested       128,988    
Performance-based stock unit [Member]            
Stock-Based Compensation Plan            
Equity Award Exchange Percentage of Award           50.00%
Stock Option Awards            
Unrecognized compensation cost related to stock awards $ 2,300     $ 2,300    
Restricted Stock Units [Abstract]            
Weighted average recognition period of cost related to stock awards 1 year 11 months          
Performance Share Units [Abstract]            
Restricted stock units granted   99,500 30,700      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 18.86 $ 41.66      
Percent of payout for performance based stock units 100.00% 112.90% 150.61% 100.00%    
Restricted stock units vested       0    
Minimum Payout [Member] | Share-based Payment Arrangement, Option [Member]            
Restricted Stock Units [Abstract]            
Vesting period       1 year    
Minimum Payout [Member] | Restricted Stock Units (RSUs) [Member]            
Restricted Stock Units [Abstract]            
Vesting period       1 year    
Minimum Payout [Member] | Performance-based stock unit [Member]            
Performance Share Units [Abstract]            
Percent of payout for performance based stock units   0.00% 0.00%      
Maximum Payout [Member] | Share-based Payment Arrangement, Option [Member]            
Restricted Stock Units [Abstract]            
Vesting period       5 years    
Maximum Payout [Member] | Restricted Stock Units (RSUs) [Member]            
Restricted Stock Units [Abstract]            
Vesting period       5 years    
Maximum Payout [Member] | Performance-based stock unit [Member]            
Performance Share Units [Abstract]            
Percent of payout for performance based stock units   200.00% 200.00%      
Performance Period for Award       3 years