CAPITAL STOCK (Tables)

12 Months Ended

Dec. 31, 2016

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

Schedule of weighted average valuation assumptions

Weighted average assumptions used in 2016, 2015 and 2014 for each of these four key inputs are listed in the following table:



	2016	2015	2014
Risk-free interest rate	1.76%	1.41%	1.21%
Expected lives	4.5 years	3.4 years	3.4 years
Expected volatility	41%	41%	43%
Expected dividend yield	0%	0%	0%

Schedule of stock options plans

A summary of our stock option plans, excluding options to purchase fractional shares resulting from our December 2010 1-for-10 reverse stock split, is as follows:



	Year Ended December 31,
	2016				2015				2014
	Options		Weighted Average Exercise Price		Options		Weighted Average Exercise Price		Options		Weighted Average Exercise Price
Outstanding at beginning of period	940,610		$	14.163	1,074,251		$	10.110	1,321,232		$	10.386
Granted at Market	129,855		$	67.706	146,446		$	36.904	134,800		$	16.398
Canceled	(463	)	$	14.881	(28,440	)	$	10.080	(218,926	)	$	17.786
Exercised	(240,385	)	$	11.886	(251,647	)	$	10.559	(162,855	)	$	7.234
Outstanding at end of period	829,617		$	23.203	940,610		$	14.163	1,074,251		$	10.110
Exercisable at end of period	532,703		$	12.140	621,559		$	10.269	729,175		$	9.800

Schedule of shares authorized under stock options plans by exercise price range

The following table summarizes information about stock options outstanding and exercisable at December 31, 2016, excluding outstanding options to purchase an aggregate of 0.5 fractional shares resulting from our December 2010 1-for-10 reverse stock split with a weighted average remaining contractual life of 0.34 years at an exercise price of $22.50. We intend to issue whole shares only from option exercises.



	Options Outstanding				Options Exercisable
Exercise Prices	Number of Options Outstanding at December 31, 2016	Weighted Average Remaining Contractual Life in Years	Weighted Average Exercise Price		Number of Options Exercisable at December 31, 2016	Weighted Average Exercise Price
$ 4.40 - $ 6.90	164,794	3.94	$	5.679	163,663	$	5.676
$ 6.91 - $ 7.36	157,323	6.89	$	7.360	114,670	$	7.360
$ 7.37 - $18.13	214,697	6.68	$	12.800	162,451	$	11.317
$18.14 - $39.76	182,303	7.93	$	34.954	91,878	$	31.057
$39.77 - $72.85	110,500	9.99	$	72.721	41	$	56.587
$ 4.40 - $72.85	829,617	6.89	$	23.203	532,703	$	12.140

Schedule of pricing models

2014, we estimated the fair values of stock purchase rights granted under the ESPP using the Black-Scholes pricing model and the following weighted average assumptions:



	2016	2015	2014
Risk-free interest rate	0.54%	0.27%	0.23%
Expected lives	1.2 years	1.2 years	1.3 years
Expected volatility	42%	36%	34%
Expected dividend yield	0%	0%	0%

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

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