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Share-Based Compensation (Details Textual) (USD $)
3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Performance unit incentive plan (PUP) [Member]
Mar. 31, 2012
Performance unit incentive plan (PUP) [Member]
Dec. 31, 2012
Performance unit incentive plan (PUP) [Member]
Mar. 31, 2013
Restricted stock units and performance based restricted stock units [Member]
Dec. 31, 2012
Restricted stock units and performance based restricted stock units [Member]
Mar. 31, 2013
Stock options [Member]
Feb. 28, 2013
Restricted Stock [Member]
Feb. 28, 2012
Restricted Stock [Member]
Mar. 31, 2013
Restricted Stock [Member]
Jan. 31, 2012
PBRS [Member]
Mar. 31, 2013
Restricted stock units [Member]
Share Based Compensation (Textual) [Abstract]                            
Unamortized cost                       $ 5,900,000    
Recognition Period of Unrecognized cost                 1 year     2 years 2 months 12 days    
Repurchase of Common Stock for Employee Tax Withholding Obligations amount 1,200,000   1,000,000                      
Repurchased shares tax withholding 44,606   50,894                      
Shares Available for Grant 1,001,609                          
Liabilities related to restricted stock             421,000 633,000            
Payments To Employees 0 0               300,000 257,000   35,000  
PUP award vested       0 0             145,506   11,300
Total unrecognized cost related to non-vested stock option awards 10,000                          
Stock options granted 0                          
Liability awards recorded       $ 4,600,000   $ 3,700,000