Incentive Plan (Tables)

3 Months Ended

Mar. 31, 2017

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

Summary of Long-Term Incentive Unit Activity

Below is a summary of our long-term incentive unit activity for the three months ended March 31, 2017.

Unvested Long-term Incentive Units	Units		Weighted-Average Grant Date Fair Value
Unvested, beginning of period	128,822		$	66.58
Granted	55,324		107.98
Vested	(41,558	)	60.83
Unvested, end of period	142,588		$	84.32

Market Performance Based Awards

In the event that the RMS Relative Market Performance during the Market Performance Period is achieved at the “threshold,” “target” or “high” level as set forth below, the awards will become vested as to the market condition with respect to the percentage of Class D units or RSUs, as applicable, set forth below:

Level	RMS Relative Market Performance	Market Performance Vesting Percentage
Below Threshold Level	≤ -300 basis points	0%
Threshold Level	-300 basis points	25%
Target Level	100 basis points	50%
High Level	> 500 basis points	100%

Summary of Incentive Award Plan's Stock Option

The following table summarizes the Amended and Restated 2004 Incentive Award Plan’s stock option activity for the three-month period ended March 31, 2017:

	Period Ended March 31, 2017
	Shares		Weighted average exercise price
Options outstanding, beginning of period	17,674		$	41.73
Exercised	(17,668	)	41.73
Options outstanding, end of period	6		$	41.73
Exercisable, end of period	6		$	41.73

Summary of Stock Options Outstanding and Exercisable

The following table summarizes information about stock options outstanding and exercisable as of March 31, 2017:

Options outstanding and exercisable
Exercise price	Number outstanding	Weighted-average remaining contractual  life (years)	Weighted-average exercise price		Aggregate intrinsic value
$41.73	6	0.09	$	41.73	$	388

Summary of Restricted Stock Activity

Below is a summary of our restricted stock activity for the three months ended March 31, 2017.

Unvested Restricted Stock	Shares		Weighted-Average Grant Date Fair Value
Unvested, beginning of period	274,642		$	73.81
Granted	107,411		108.00
Vested	(86,209	)	67.27
Cancelled or expired	(4,366	)	79.75
Unvested, end of period	291,478		$	88.25