Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of the Company's Stock Option Activity

A summary of the Company’s stock option activity is as follows:

	Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Options outstanding as of January 1, 2017		966,060		$	17.78
Granted		273,800			25.68
Exercised		(258,699	)		19.86
Forfeited		(80,727	)		20.45
Cancelled		(24,287	)		26.98
Options outstanding as of December 31, 2017		876,147			19.13
Granted		187,484			32.31
Exercised		(96,125	)		19.81
Forfeited		(5,215	)		25.44
Cancelled		(5,931	)		24.36
Options outstanding as of December 31, 2018		956,360		$	21.57	$	0.6
Options exercisable as of:
December 31, 2018		511,899		$	17.98	$	0.6

Schedule of the Assumptions Used to Estimate the Fair Value of Each Option Grant

The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing method with the following assumptions:

	2018			2017			2016
Expected Life (years)		6.5			6.5			6.5
Risk-free Interest rate		2.8	%		2.2	%		1.6	%
Expected volatility		43.7	%		45.0	%		45.0	%
Expected dividend yield		—	%		—	%		—	%

Restricted Stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Nonvested Share Activity

A summary of activity for restricted stock awards for the years ended December 31, 2018 and 2017 are as follows:

	Shares			Weighted Average Grant Date Fair Value Per Share
Unvested as of January 1, 2017		39,028		$	86.92
Granted		—			—
Vested		(11,058	)		86.92
Forfeited		(5,546	)		86.92
Unvested as of December 31, 2017		22,424			86.92
Granted		—			—
Vested		(22,424	)		86.92
Forfeited		—			—
Unvested as of December 31, 2018		—		$	—

Restricted Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Nonvested Share Activity

A summary of activity for restricted stock units for the years ended December 31, 2018 and 2017 are as follows:

	Shares			Weighted Average Grant Date Fair Value Per Share
Unvested as of January 1, 2017		241,108		$	49.03
Granted		152,855			26.05
Vested		(45,755	)		93.55
Forfeited		(28,208	)		35.61
Unvested as of December 31, 2017		320,000			32.71
Granted		111,713			28.49
Vested		(203,355	)		38.81
Forfeited		(8,869	)		21.04
Unvested as of December 31, 2018		219,489		$	25.37

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Nonvested Share Activity

A summary of activity for performance stock units for the years ended December 31, 2018 and 2017 are as follows:

	Shares			Weighted Average Grant Date Per Share
Unvested as of January 1, 2017		201,257		$	28.45
Granted		115,047			30.58
Vested		(17,637	)		85.03
Forfeited		(29,425	)		25.59
Unvested as of December 31, 2017		269,242			25.97
Granted		93,298			33.86
Vested		—			—
Forfeited		(3,675	)		30.31
Unvested as of December 31, 2018		358,865		$	27.98