Equity Plans (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The restricted and phantom units in the table below have been recast to reflect the reverse split.

	Units			Weighted-Average Grant Date Fair Value
Unvested—January 1, 2014		49,354		$	139.60
Vested—restricted units		(44,993	)	$	139.70
Granted—restricted units		137,746		$	132.30
Forfeited		(10,519	)	$	137.30
Unvested—December 31, 2014		131,588		$	132.10
Vested—restricted units		(91,798	)	$	121.13
Vested—phantom units		(4,856	)	$	67.10
Granted—restricted units		142,255		$	55.25
Granted—phantom units		42,349		$	62.31
Modification—restricted units		226,401		$	68.85
Modification—phantom units		41,269		$	58.36
Forfeited(1)		(20,994	)	$	89.97
Unvested—December 31, 2015		466,214		$	69.80

(1) We implemented a company-wide initiative to reduce operating costs in 2015 and beyond, which included a reduction in work force. As a result, 7,263 restricted units were forfeited during the year ended December 31, 2015.

The following table summarizes information regarding restricted and phantom unit activity during the years ended December 31, 2015 and 2014:

	Units			Weighted-Average Grant Date Fair Value
Unvested—January 1, 2014		250,557		$	22.13
Vested—restricted units		(208,361	)	$	22.15
Granted—restricted units		871,078		$	23.25
Forfeited		(78,478	)	$	23.33
Unvested—December 31, 2014		834,796		$	23.18
Vested—restricted units		(457,458	)	$	22.91
Vested—phantom units		(21,578	)	$	16.05
Granted—restricted units		535,858		$	15.89
Granted—phantom units		171,648		$	15.76
Modification—restricted units		(823,277	)	$	20.06
Modification—phantom units		(150,070	)	$	18.93
Forfeited(1)		(89,919	)	$	16.05
Unvested—December 31, 2015		—		$	—

(1) We implemented a company-wide initiative to reduce operating costs in 2015 and beyond, which included a reduction in work force. As a result, 39,172 restricted units were forfeited during the year ended December 31, 2015.