Long-Term Incentive Plan (Total Non-Vested Unit Awards) (Details) - Management [Member] $ in Millions	Dec. 31, 2015 USD ($) shares
Long Term Incentive Plan [Line Items]
Unit Awards Granted	408,015
Estimated Forfeitures	53,500
Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results	157,515
Total Unit Award Accrual	512,030
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 19.6	[1]
2014 Awards [Member] | Performance Shares [Member]
Long Term Incentive Plan [Line Items]
Unit Awards Granted	187,371
Estimated Forfeitures	21,662
Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results	124,283
Total Unit Award Accrual	289,992
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 7.0	[1]
2015 Awards [Member] | Performance Shares [Member]
Long Term Incentive Plan [Line Items]
Unit Awards Granted	148,028
Estimated Forfeitures	15,105
Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results	33,232
Total Unit Award Accrual	166,155
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 9.8	[1]
Retention Awards Vesting 2016 [Member] | Time-Based Awards [Member]
Long Term Incentive Plan [Line Items]
Unit Awards Granted	20,757
Estimated Forfeitures	12,121
Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results	0
Total Unit Award Accrual	8,636
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 0.2	[1]
Retention Awards Vesting 2017 [Member] | Time-Based Awards [Member]
Long Term Incentive Plan [Line Items]
Unit Awards Granted	51,859
Estimated Forfeitures	4,612
Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results	0
Total Unit Award Accrual	47,247
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $	$ 2.6	[1]

[1] Unrecognized compensation expense will be recognized over the remaining vesting period of the awards.