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Equity Awards - Restricted Shares Narrative (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
Restricted Shares [Member]
Sep. 30, 2012
Restricted Shares [Member]
Sep. 30, 2013
Restricted Shares [Member]
Sep. 30, 2012
Restricted Shares [Member]
Sep. 30, 2013
Restricted Shares [Member]
Non-employee independent director [Member]
Deferred Compensation, Share-based Payments [Member]
Mar. 31, 2013
Plan 1 [Member]
Service-based restriced shares [Member]
Mar. 31, 2013
Plan 2 [Member]
Service-based restriced shares [Member]
Sep. 30, 2013
Plan 3 [Member]
number
Mar. 31, 2013
Plan 3 [Member]
Restricted Shares [Member]
Mar. 31, 2013
Plan 3 [Member]
Service-based restriced shares [Member]
Mar. 31, 2013
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
Plan 5 [Member]
Service-based restriced shares [Member]
Mar. 31, 2013
Plan 5 [Member]
Service-based restriced shares [Member]
Non-employee independent director [Member]
Mar. 31, 2013
Minimum [Member]
Plan 2 [Member]
Service-based restriced shares [Member]
Mar. 31, 2013
3 year cash flow metric [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
3 year cash flow metric [Member]
Minimum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
3 year cash flow metric [Member]
Maximum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
3 year EPS CAGR metric [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
3 year EPS CAGR metric [Member]
Minimum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
3 year EPS CAGR metric [Member]
Maximum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
2012 EPS growth metric [Member]
Plan 4 [Member]
Performance-based restriced shares [Member]
Dec. 31, 2012
2012 EPS growth metric [Member]
Plan 4 [Member]
Performance-based restriced shares [Member]
Dec. 31, 2012
2012 & 2013 EPS CAGR metric [Member]
Plan 4 [Member]
Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                              
Restricted shares issued related to director fee deferrals         4,013                                    
Number of Unvested Restricted Shares Granted     403,615     29,498 41,480   238,808 119,404,000 119,404,000   17,240               72,576    
Award requisite service period           3 years 1 year     3 years   1 year                      
ICP, Threshold target for granting stock awards                           $ 20,000                  
Cash value of incentive plan             80.00%                                
Restriced shares value of incentive plan             20.00%                                
Award vesting period                     3 years                        
Award percentage earned based on metric over the performance period                             25.00%     75.00%       60.00% 40.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained                                           175.00%  
Number of performance metrics in restricted shares award type plan               2                              
Amount of shares earned % of target award                               30.00% 200.00%   30.00% 250.00%      
Unrecognized unvested restricted shares-based compensation expense 8,200,000   8,200,000                                        
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense     1 year 7 months                                        
Restricted shares-based compensation expense $ 2,400,000 $ 2,700,000 $ 7,100,000 $ 6,200,000