Employee Stock Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Number of Stock-Based Awards Granted and Outstanding

The Company granted the following number of stock-based awards:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Stock options	—			10,000		783,700		986,900
Stock appreciation rights		15,200	—			40,400		176,200
Restricted stock awards		86,356	—			86,356	—
Restricted stock units		120,845		2,553		494,681		239,763
Performance units	—		—			119,839		51,977

The Company had the following number of stock-based awards outstanding:

	September 30, 2016		December 31, 2015
Stock options		5,934,854		6,647,999
Stock appreciation rights		512,876		530,701
Restricted stock awards		86,356	—
Restricted stock units		777,331		359,553
Performance units		164,886		49,667

Assumptions Used to Estimate Value of Stock-Based Compensation for Stock Options and Stock Appreciation Rights Issued

The Company used the following assumptions when estimating the value of the stock-based compensation for stock options and stock appreciation rights issued as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Expected volatility	26 – 29%		26 –36%		26 – 30%		26 – 41%
Weighted average expected volatility		27%		30%		28%		35%
Expected dividends		0.0%		0.0%		0.0%		0.0%
Expected term (in years)	3.6 – 6.6		3.7 – 6.7		3.6 – 6.6		3.7 – 6.7
Risk-free interest rate	0.96 – 1.36%		1.08 – 1.83%		0.80 – 1.57%		1.06 – 2.00%