Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Assumptions Used to Estimate Fair Value of Each SAR

For SARs issued in the six months ended June 30, 2014 and 2013, respectively, the assumptions shown in the following table were used:

	Six Months Ended June 30,
	2014			2013
Weighted-average fair value of grants	$	18.52		$	11.68
Dividend yield		0	%		0	%
Average risk-free interest rate		1.8	%		0.7	%
Expected term (years)		5			5
Expected volatility		54	%		64	%

Summary of Stock-Based Compensation Grants

The following table summarizes the Company’s stock-based compensation grants for the six months ended June 30, 2014:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Stock appreciation rights		3,340	$	38.95
Time-based restricted stock		54,216	$	33.73
Performance-based restricted stock		42,676	$	33.72

Summary of Stock-Based Compensation Expense

The following table summarizes the Company’s stock-based compensation expense for the three and six months ended June 30, 2014 and 2013 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Stock appreciation rights	$	222	$	307	$	591	$	638
Time-based restricted stock		770		586		1,478		1,123
Performance-based restricted stock		283		—		365		—
Employee stock purchase plan		11		9		21		36
Total stock-based compensation	$	1,286	$	902	$	2,455	$	1,797