Equity Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2016

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

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions for the years ended December 31:

	2016		2015		2014
Risk-free interest rate	1.8	%	1.8	%	1.6	%
Expected life	5.5 years		5.5 years		5.1 years
Expected volatility	42	%	43	%	46	%
Expected dividend yield	—	%	—	%	—	%

Schedule of Nonvested Share Activity

The following is a summary of the option activity as of December 31, 2016 and changes during the year then ended:

In thousands except per share amounts and years
	Shares	Weighted-Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding at December 31, 2015	463	$	20.15
Granted	57	$	52.22
Exercised	(76)	$	15.18
Forfeited/Cancelled	(17)	$	19.31
Outstanding at December 31, 2016	427	$	25.32	6.9	$	15,694
Options exercisable at December 31, 2016	240	$	15.66	5.5	$	11,097
Unvested at December 31, 2016	187	$	37.74	8.8	$	4,597

Schedule of Nonvested Restricted Stock Units Activity

The following is a summary of the Company’s unvested restricted shares for the year ended and as of December 31, 2016:

In thousands except per share amounts
Outstanding Restricted Shares	Shares	Weighted-Average Grant-Date Fair Value
Nonvested at December 31, 2015	343	$	24.01
Granted	84	$	49.70
Vested	(98)	$	16.96
Forfeited/Cancelled	(33)	$	20.92
Nonvested December 31, 2016	296	$	34.01