Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation [Abstract]

Summary of the status of the company's stock option plan

A summary of the Company’s stock option activity at December 31, 2015 and changes during the period are presented in the table below (share numbers and aggregate intrinsic values in thousands):

	Number of Options Outstanding		Weighted Average Exercise Price		Weighted Average Contractual Term (Years)	Aggregate Intrinsic Value
Balances, December 31, 2014	402		$	25.42
Granted	—		—
Exercised	(163	)	19.81
Forfeited, canceled or expired	(33	)	42.81
Balances, December 31, 2015	206		$	27.08	3.8	$	3,902
Options vested and expected to vest at December 31, 2015	206		$	27.07	3.8	$	3,898
Options vested at December 31, 2015	198		$	26.98	3.7	$	3,776

Assumption used to value options granted during the period

The assumptions used to value options granted during December 31, 2013 were as follows:

	Year Ended December 31, 2013
Dividend yield	—
Annual risk free rate of return	0.8	%
Expected volatility	47.0	%
Expected term (years)	4.2

Summary of company restricted stock unit activity

A summary of the Company’s restricted stock unit activity for the year ended December 31, 2015, is as follows (share numbers in thousands):

	Number of Units Outstanding		Weighted Average Grant Date Fair Value
Awarded and unvested, December 31, 2014	3,704		$	42.17
Granted	2,412		44.43
Vested	(1,617	)	39.90
Forfeited	(1,349	)	43.99
Awarded and unvested, December 31, 2015	3,150		$	44.28
Restricted stock units expected to vest, December 31, 2015	2,714

Schedule of restricted award grant activity

The chart below summarizes grant activity during the year ended December 31, 2015 by equity plan (share numbers in thousands):

	Grants in 2015
2006 Equity Incentive Plan
Restricted stock units (1)	1,355
Performance-based restricted stock units (2) (3)	637
Total grants under 2006 Plan	1,992
2015 Equity Incentive Plan
Restricted stock units (1)	155
Total grants under 2015 Plan	155
2015 Inducement Plan
Restricted stock units (4)	70
Performance-based restricted stock units (4)	108
Total grants pursuant to Inducement Awards	178
Inducement Plan
Restricted stock units (4)	44
Performance-based restricted stock units (4)	43
Total grants pursuant to Inducement Awards	87
Total awards granted in 2015	2,412