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Equity Awards - Restricted Shares Narrative (Details) (USD $)
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Restricted Shares [Member]
Mar. 31, 2013
Restricted Shares [Member]
Mar. 31, 2014
Restricted Shares [Member]
Non-employee independent director [Member]
Deferred Compensation, Share-based Payments [Member]
Mar. 31, 2014
Plan 1 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
Plan 2 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
Plan 3 [Member]
number
Mar. 31, 2014
Plan 3 [Member]
Restricted Shares [Member]
Mar. 31, 2014
Plan 3 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2014
Plan 5 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
Plan 5 [Member]
Service-based restriced shares [Member]
Non-employee independent director [Member]
Mar. 31, 2014
Minimum [Member]
Plan 2 [Member]
Service-based restriced shares [Member]
Mar. 31, 2014
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, 2014
3 year EPS CAGR metric [Member]
Maximum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2014
3 year ROIC metric [Member] [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2014
3 year ROIC metric [Member] [Member]
Minimum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2013
3 year ROIC metric [Member] [Member]
Minimum [Member]
Plan 3 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2014
3 year ROIC metric [Member] [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, 2013
2012 EPS growth metric [Member]
Plan 4 [Member]
Performance-based restriced shares [Member]
Mar. 31, 2014
2012 & 2013 EPS CAGR metric [Member]
Plan 4 [Member]
Performance-based restriced shares [Member]
Dec. 31, 2013
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     2,378                                        
Number of Unvested Restricted Shares Granted 346,451     23,226 40,837   243,124 121,562,000 121,562,000   20,832                 72,576   16,054  
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                         75.00%     25.00%         60.00%   40.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained                                         175.00%   125.00%
Number of performance metrics in restricted shares award type plan           2                                  
Amount of shares earned % of target award                           30.00% 250.00%   30.00% 30.00% 200.00%        
Unrecognized unvested restricted shares-based compensation expense 16,400,000                                            
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense 2 years 5 months                                            
Restricted shares-based compensation expense $ 2,300,000 $ 2,700,000