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Equity-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
2005 Equity Incentive Plan [Member]
Jan. 31, 2013
Performance Stock Units [Member]
Jan. 31, 2012
Performance Stock Units [Member]
Dec. 31, 2013
Performance Stock Units [Member]
Dec. 31, 2012
Performance Stock Units [Member]
Dec. 31, 2011
Performance Stock Units [Member]
Sep. 30, 2009
Performance Stock Units [Member]
Dec. 31, 2013
Management Stock Purchase Plan [Member]
Dec. 31, 2012
Management Stock Purchase Plan [Member]
Dec. 31, 2011
Management Stock Purchase Plan [Member]
Dec. 31, 2013
Maximum [Member]
Performance Stock Units [Member]
Dec. 31, 2011
Maximum [Member]
Performance Stock Units [Member]
Dec. 31, 2013
Minimum [Member]
Performance Stock Units [Member]
Dec. 31, 2011
Minimum [Member]
Performance Stock Units [Member]
Dec. 31, 2013
Unvested Restricted Stock Units [Member]
Dec. 31, 2012
Unvested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Typical vesting period, in years 4 years                                    
Maximum number of shares that may be issued under the Plan       3,000,000                              
Maximum number of shares that may be issued in connection with grants of incentive stock options and rights       900,000                              
Number of shares available for issuance under the Plan 605,000                                    
Unamortized portion of compensation expense related to awards     $ 885,000                                
Options granted 0 0                                  
Percentage of target performance stock units earned             50.00% 58.30%             200.00%   0.00%    
Performance stock unit conversion date fair value           8,319,000                          
Targeted Performance Stock Units             246,000 280,000 868,000                    
Performance stock units outstanding             246,000 280,000 868,000 905,000                  
Shares awarded         304,000 295,000                          
Performance stock unit grant-date fair value         4,123,000 4,152,000                          
Performance stock units earned             123,000 163,200 684,299                    
Performance stock unit vesting period                           3 years   1 year      
Service period             5 years                        
Weighted average fair value of per unit awarded                     $ 15.97 $ 12.30              
Number of restricted stock units credited to participant accounts 614,888 777,159                 132,037 253,587 164,589         47,268 71,992
Market price of common stock, per share $ 18.59                                    
Requisite vesting age 60 years                                    
Accrues interest                     2.00%                
Intrinsic value of options exercisable 1,759,000                                    
Weighted average remaining life of options exercisable 4 years 9 months 18 days                                    
Unrecognized compensation cost $ 3,400,000                                    
Weighted average cost recognition period, in years 2 years 10 months 24 days