Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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

Schedule of unvested restricted stock awards

The following tables summarize the unvested restricted stock awards at September 30, 2017 and 2016.

	Nine Months Ended September 30,
	2017					2016
Perfomance Awards	Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value
Unvested at beginning		33,226		$	42.60		—		$	—
Issued		36,523			57.49		34,957			42.60
Forfeited		(3,097	)		42.60		(1,731	)		42.60
Vested		(4,314	)		54.92		—			—
Unvested at end		62,338		$	50.45		33,226		$	42.60

	Nine Months Ended September 30,
	2017					2016
Time Vested Awards	Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value
Unvested at beginning		262,966		$	33.60		369,093		$	24.43
Issued		91,097			62.70		104,775			46.39
Forfeited		(1,477	)		47.69		(7,815	)		40.17
Vested		(187,600	)		30.07		(195,738	)		22.53
Unvested at end		164,986		$	53.56		270,315		$	33.87

Schedule of activity of stock options

Below is a summary of stock option activity for the nine months ended September 30, 2017 and 2016. The information excludes restricted stock units and awards.

	Nine Months Ended September 30,
	2017					2016
	Shares			Weighted-Average Exercise Price		Shares			Weighted-Average Exercise Price
Beginning balance		216,859		$	8.80		298,740		$	9.97
Issued		—			—		3,000			49.49
Exercised		(64,420	)		7.46		(24,458	)		13.10
Forfeited		—			—		(1,100	)		15.48
Expired		—			—		(6,637	)		12.87
Ending balance		152,439		$	9.36		269,545		$	10.03

Schedule of stock option by exercise price range

The following summarizes information about stock options outstanding at September 30, 2017. The information excludes restricted stock units and awards.

						Weighted-Average
Outstanding:		Stock Options		Weighted-Average		Remaining
Range of Exercise Prices		Outstanding		Exercise Price		Contractual Life
$5.76	$10.72		101,075	$	5.76		1.26
$10.73	$11.40		41,389		10.84		0.77
$11.41	$24.86		3,225		22.79		6.02
$24.87	$49.91		6,750		47.83		8.37
			152,439	$	9.36		1.54

Exercisable:		Stock Options		Weighted-Average
Range of Exercise Prices		Exercisable		Exercise Price
$5.76	$10.72		66,377	$	5.76
$10.73	$11.40		41,389		10.84
$11.41	$24.86		2,065		23.18
$24.87	$49.91		750		49.49
			110,581	$	8.28

Schedule of valuation assumptions used for stock options

There were no grants of stock options during the nine months ended September 30, 2017.

	Nine Months Ended		Years Ended December 31,
	September 30, 2017		2016			2015
Expected volatility		n/a		24.23	%		31.21	%
Weighted-Average volatility		n/a		24.23	%		31.21	%
Expected dividends		—		—			—
Expected term (in years)		n/a		7.0			7.0
Risk-free rate		n/a		1.37	%		1.64	%
Weighted-average fair value (grant date)		n/a	$	14.27		$	16.73