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Share-Based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Share-Based Compensation (Details Textual)      
Tax shortfall in earnings related to share-based compensation   $ 0 $ 1,200,000
Stock-based compensation expenses   770,000 879,000
Share-based compensation (capitalized)   $ 200,000 $ 300,000
Employee Stock Option [Member]      
Share-Based Compensation (Details Textual)      
Expired stock option awards   (111,984)  
Options outstanding, end of period, shares 1,218,406 1,218,406  
Stock option awards outstanding aggregate intrinsic value $ 0 $ 0  
Stock option awards exercisable aggregate intrinsic value 0 0  
Stock option award unrecognized compensation cost $ 0 $ 0  
Remaining contract life of outstanding stock options 3 years 10 months    
Remaining contract life of exercisable stock options 3 years 10 months    
Restricted Stock Awards [Member]      
Restricted stock activity      
Restricted shares outstanding, beginning of period, shares   1,487,076  
Restricted shares outstanding, beginning of period, weighted average price   $ 8.94  
Restricted shares granted, shares   0  
Restricted shares granted, weighted average price   $ 0.00  
Restricted shares canceled, shares   (57,077)  
Restricted shares canceled, weighted average price   $ 9.21  
Restricted shares vested, shares   (223,690)  
Restricted shares vested, weighted average price   $ 15.35  
Restricted shares outstanding, end of period, shares 1,206,309 1,206,309  
Restricted shares outstanding, end of period, weighted average price $ 7.73 $ 7.73  
Share-Based Compensation (Details Textual)      
Unrecognized compensation cost for stock grants $ 2,300,000 $ 2,300,000  
Weighted average remaining recognition period of cost for stock grants   1 year 2 months  
Grant date fair value of shares vested   $ 3,400,000  
Restricted Stock Units (RSUs) [Member]      
Restricted stock activity      
Restricted shares outstanding, beginning of period, shares   591,400  
Restricted shares outstanding, beginning of period, weighted average price   $ 9.20  
Restricted shares granted, shares   0 216,450
Restricted shares granted, weighted average price   $ 0.00 $ 1.98
Restricted shares canceled, shares   0  
Restricted shares canceled, weighted average price   $ 0.00  
Restricted shares vested, shares   (189,700)  
Restricted shares vested, weighted average price   $ 15.01  
Restricted shares outstanding, end of period, shares 401,700 401,700  
Restricted shares outstanding, end of period, weighted average price $ 6.45 $ 6.45  
Share-Based Compensation (Details Textual)      
Restricted Stock Awards Vesting Term     3 years
Unrecognized compensation cost for stock grants $ 600,000 $ 600,000  
Weighted average remaining recognition period of cost for stock grants   1 year 5 months  
Required stock price for payout on performance based restricted stock units     $ 5.22
Percent of payout for performance based restricted stock unit grants     100.00%
Cash-settled Restricted Stock Unit (RSUs) [Member]      
Restricted stock activity      
Restricted shares granted, shares     147,812
Share-Based Compensation (Details Textual)      
Restricted Stock Awards Vesting Term     1 year
Cash-Settled Restricted Stock Unit Liability $ 100,000 $ 100,000  
Minimum [Member] | Restricted Stock Awards [Member]      
Share-Based Compensation (Details Textual)      
Restricted Stock Awards Vesting Term   1 year  
Minimum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation (Details Textual)      
Percent of payout for performance based restricted stock unit grants     0.00%
Maximum Payout [Member] | Restricted Stock Awards [Member]      
Share-Based Compensation (Details Textual)      
Restricted Stock Awards Vesting Term   3 years  
Maximum Payout [Member] | Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation (Details Textual)      
Percent of payout for performance based restricted stock unit grants     200.00%
General and Administrative Expense [Member]      
Share-Based Compensation (Details Textual)      
Stock-based compensation expenses   $ 700,000 $ 800,000
Lease Operating Cost [Member]      
Share-Based Compensation (Details Textual)      
Stock-based compensation expenses   $ 100,000 $ 100,000