v2.4.0.8
Long-Term Incentive Plan (Equity-Based Incentive Compensation Expense) (Details) (Management [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income $ 5,088 $ 4,856
G&A Expense [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 4,974 4,485
Operating Expenses [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 114 371
Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 3,616 2,836
Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 1,472 2,020
Performance Based Awards [Member] | Two Thousand Ten Awards [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income   194
Performance Based Awards [Member] | Two Thousand Ten Awards [Member] | Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income   121
Performance Based Awards [Member] | Two Thousand Ten Awards [Member] | Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income   73
Performance Based Awards [Member] | Two Thousand Eleven Awards [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income   2,130
Performance Based Awards [Member] | Two Thousand Eleven Awards [Member] | Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income   983
Performance Based Awards [Member] | Two Thousand Eleven Awards [Member] | Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income   1,147
Performance Based Awards [Member] | Two Thousand Twelve Awards [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 1,946 1,492
Performance Based Awards [Member] | Two Thousand Twelve Awards [Member] | Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 1,022 881
Performance Based Awards [Member] | Two Thousand Twelve Awards [Member] | Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 924 611
Performance Based Awards [Member] | Two Thousand Thirteen Awards [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 1,729 915
Performance Based Awards [Member] | Two Thousand Thirteen Awards [Member] | Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 1,181 726
Performance Based Awards [Member] | Two Thousand Thirteen Awards [Member] | Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 548 189
Performance Based Awards [Member] | Two Thousand Fourteen Awards [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 904  
Performance Based Awards [Member] | Two Thousand Fourteen Awards [Member] | Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 904  
Performance Based Awards [Member] | Two Thousand Fourteen Awards [Member] | Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 0  
Retention Awards [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 509 125
Retention Awards [Member] | Equity Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income 509 125
Retention Awards [Member] | Liability Method [Member]
    
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]    
Allocation of LTIP expense on consolidated statements of income $ 0 $ 0