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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) (USD $)
3 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Long-term Incentive Plan 2006 and 2009
Mar. 31, 2014
Employees
Restricted stock units
Mar. 31, 2014
Employees
Amended restricted stock units vesting on January 1, 2014
Mar. 31, 2014
Employees
Service-based restricted stock units vesting on March 2014
Jan. 10, 2014
Employees
Common Stock Subject to Sales Restriction [Member]
Jan. 31, 2014
Employees
Common shares
Jan. 31, 2014
Employees
Service-based restricted stock units
Jan. 10, 2014
Employees
Service-based restricted stock units
Dec. 31, 2013
Employees
Service-based restricted stock units
Jan. 31, 2014
Employees
Performance-based restricted stock units vesting on December 31, 2016
Mar. 31, 2014
Employees
Performance-based restricted stock units vesting on December 31, 2016
Jan. 10, 2014
Employees
Performance-based restricted stock units vesting on December 31, 2016
Jan. 31, 2014
Employees
Performance-based restricted stock units vesting on December 31, 2016
Minimum
Jan. 31, 2014
Employees
Performance-based restricted stock units vesting on December 31, 2016
Maximum
Feb. 28, 2013
Employees
Service-based restricted stock units vesting on February 1, 2016
Mar. 31, 2014
Employees
Service-based restricted stock units vesting on February 1, 2016
Mar. 31, 2014
Employees
Performance based restricted stock units vesting on December 31, 2014
Feb. 28, 2013
Employees
Performance-based restricted stock units
Feb. 28, 2013
Employees
Performance-based restricted stock units
Minimum
Feb. 28, 2013
Employees
Performance-based restricted stock units
Maximum
Mar. 31, 2014
Employees
Service based restricted stock units with specified vesting dates
Mar. 31, 2014
Employees
Service based restricted stock units with specified vesting dates
Minimum
Mar. 31, 2014
Company's chairman and chief executive officer
Service-based restricted stock units vesting on June 15, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                  
Stock-based compensation expense $ 2,075,000 $ 5,202,000                                              
Unrecognized compensation cost 5,000,000                                                
Weighted-average period to recognize the unrecognized compensation cost 0 years 10 months 10 days                                                
Deferred compensation share-based arrangements, liability, current and noncurrent $ 600,000                                                
Shares available for issuance     4,000,000                                            
Vested (in shares)       1,736,053 1,696,053 40,000                                      
Restricted shares awarded       898,598                                          
Non-vested, outstanding (in shares)             229,235       66,564   51,458         195,382 195,209       50,666   600,000
Vesting term                 3 years               3 years             3 years  
Sale restriction period               2 years                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Number                   67,637       51,726                      
Vesting percentage                             0.00% 200.00%         0.00% 200.00%      
Risk-free interest rate                       0.76%               0.26%          
Expected stock price volatility                       44.84%               50.44%