Employees, Retirement and Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted unit activity and changes during the nine months ended September 30, 2016, is presented below:

Restricted Units	Units		Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016 (nonvested)	101,408		$	33.63
Granted	12,231		25.65
Vesting and transfer of common units to recipients	(4,547	)	33.01
Forfeited	(3,849	)	34.21
Outstanding at September 30, 2016 (nonvested)	105,243		$	32.71

Schedule of Nonvested Performance-based Units Activity

A summary of performance unit activity and changes during the nine months ended September 30, 2016, is presented below:

Performance Units	Units
Outstanding at January 1, 2016 (nonvested)	45,494
Granted	10,725
Vesting and transfer of common units to recipients	(26,157	)
Forfeited	(2,679	)
Outstanding at September 30, 2016 (nonvested)	27,383