Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Stock-Based Compensation

Summary of stock option activity

					WEIGHTED-
			WEIGHTED-		AVERAGE	AGGREGATE
			AVERAGE		REMAINING	INTRINSIC
			EXERCISE		CONTRACTUAL	VALUE
	SHARES		PRICE		LIFE (in years)	(in thousands)
Options outstanding at January 1, 2014	2,326,201		$	27.02	2.3
Exercised	(489,402	)	30.32
Forfeited	(13,473	)	22.07
Options outstanding at March 31, 2014	1,823,326		$	26.17	2.6	$	32,057
Available for future grant	3,344,945
Total shares reserved at March 31, 2014	5,168,271
Options exercisable at March 31, 2014	1,591,330		$	27.23	2.3	$	27,184
Options outstanding at January 1, 2015	1,385,497		$	23.30	2.2
Exercised	(384,999	)	20.98
Forfeited	(16,667	)	18.22
Options outstanding at March 31, 2015	983,831		$	24.30	2.4	$	26,852
Available for future grant	3,496,458
Total shares reserved at March 31, 2015	4,480,289
Options exercisable at March 31, 2015	973,831		$	24.28	2.4	$	26,629

Summary of activity that relates to the Company's restricted stock unit awards

	2015			2014
Restricted stock units at January 1		368,084			539,106
Shares awarded	170,994			131,597
Shares vested	(231,969		)	(298,791		)
Shares forfeited	(11,082		)	(2,428		)
Restricted stock units at March 31		296,027			369,484