Stock Option and Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2016

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

Summary of the stock option activity including weighted average exercise prices, options outstanding and exercisable

A summary of the stock option activity, weighted average exercise prices, options outstanding and exercisable as of December 31, 2016, 2015 and 2014 is as follows:

	Years ended December 31,
	2016				2015				2014
	Common Stock Options		Weighted Average Exercise Price		Common Stock Options		Weighted Average Exercise Price		Common Stock Options		Weighted Average Exercise Price
Outstanding, December 31, 2015	3,009		$	30.43	3,680		$	21.03	2,708		$	9.41
Granted	972		$	60.40	764		$	47.31	1,744		$	33.92
Exercised	(428	)	$	15.73	(1,133	)	$	10.31	(621	)	$	4.75
Expired or forfeited	(194	)	$	48.63	(302	)	$	34.09	(151	)	$	28.50
Outstanding, December 31, 2016	3,359		$	39.92	3,009		$	30.43	3,680		$	21.03

	Years ended December 31,
	2016	2015	2014
Options exercisable at December 31, 2016	1,531	955	993
Weighted average grant date fair value (per share) of options granted during the period	38.18	31.33	24.41

Summary of the stock options outstanding and exercisable

A summary of the stock options outstanding and exercisable as of December 31, 2016 is as follows:

		December 31, 2016
		Options Outstanding			Options Exercisable
Range of Exercise Prices	Total Options Outstanding	Weighted Average Remaining Life (Years)	Weighted Average Exercise Price		Number Exercisable	Weighted Average Exercise Price
$0.12-$10.03	193	5.3	$	6.84	137	$	5.52
$10.04-$20.00	273	6.5	$	13.44	170	$	13.48
$20.01-$30.00	154	6.8	$	25.56	114	$	25.53
$30.01-$40.00	1,087	6.7	$	32.70	758	$	32.97
$40.01-$55.00	1,125	8.6	$	46.22	319	$	45.49
$55.01-$73.22	527	9.0	$	71.33	33	$	69.08
	3,359	7.6	$	39.92	1,531	$	31.19
Aggregate Intrinsic Value	254				254

Schedule of cash proceeds from, and the aggregate intrinsic value of, stock options exercised

Cash proceeds from, and the aggregate intrinsic value of, stock options exercised during the years ended December 31, 2016, 2015 and 2014, respectively, were as follows:

	Years ended December 31,
	2016		2015		2014
Cash proceeds from options exercised	$	6,934	$	11,473	$	2,949
Aggregate intrinsic value of options exercised	$	14,439	$	49,255	$	21,646

Summary of the Company's outstanding shares of RSU awards

The following table presents a summary of the Company's outstanding shares of RSU awards granted as of December 31, 2016:

	Restricted Stock Units		Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2015	288		$	44.54
Awarded	583		$	58.19
Vested	(109	)	$	43.88
Forfeited	(41	)	$	50.60
Outstanding, December 31, 2016	721		$	55.33