STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2013

STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION

Schedule of assumptions used to determine the fair value of options as of the grant date

	2013		2012		2011
	Black-Scholes	Binomial	Black-Scholes	Binomial	Black-Scholes	Binomial
Risk-free interest rate (%)	1.02 — 1.81	0.01 — 2.71	0.87 — 1.17	0.08 — 2.04	1.69 — 1.93	0.04 — 3.03
Expected stock price volatility (%)	36.35 — 36.76	36.40 — 36.80	34.22 — 34.65	34.20 — 34.60	48.00	55.70 — 55.80
Expected dividend yield	—	—	—	—	—	—
Expected option life (in years)	6.25	—	6.25	—	6.25	—
Contractual life (in years)	—	14	—	14	—	14
Fair value	$31.33 — $49.14	$16.12 — $41.72	$19.25 — $29.80	$9.98 — $22.76	$16.33 — $17.85	$16.91 — $20.39

Summary of the weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised

		2013		2012		2011
Weighted average fair value at date of grant		$	32.59	$	20.77	$	17.66
Intrinsic value of options exercised	(in thousands)	40,761		17,598		4,966
Fair value of options vested	(in thousands)	3,156		2,790		3,536

Summary of the activity of the entity's stock options

	Number of options		Weighted average exercise price		Weighted average contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2012	3,058,309		$	17.69	6.11	$	211,072
Granted	75,000		104.84
Exercised	(401,718	)	16.48
Forfeited	(142,248	)	55.35
Outstanding at December 31, 2013	2,589,343		18.33		5.20	363,293
Exercisable at December 31, 2013	2,194,755		12.68		4.79	320,326

Summary of information about stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at December 31, 2013:

	Options outstanding				Options exercisable
Exercise price range	Number	Weighted average remaining contractual life	Weighted average exercise price		Number	Weighted average remaining contractual life	Weighted average exercise price
$0.00 — $10.00(a)	1,700,112	4.49	$	9.14	1,700,112	4.49	$	9.14
$10.01 — $20.00(a)	97,737	2.80	12.45		97,737	2.80	12.45
$20.01 — $30.00(a)	502,686	6.30	23.07		328,625	6.31	23.15
$30.01 — $40.00(a)	61,058	6.98	33.54		23,874	7.30	33.44
$50.01 — $60.00(a)	10,000	8.37	53.00		3,750	8.37	53.00
$60.01 — $70.00(a)	142,750	8.19	60.67		40,657	8.19	60.67
$80.01 — $90.00(a)	15,000	9.12	83.86		—	—	—
$90.01 — $100.00(a)	30,000	9.21	94.19		—	—	—
$120.01 — $130.00(a)	30,000	9.62	125.98		—	—	—
	2,589,343				2,194,755

Summary of the market prices for options to begin to vest

	Market-based options
Vesting price	Ordinary performance		Extraordinary performance
$160.01 — $170.00	7,500		—
Over $170.00	22,500		52,125
	30,000		52,125
Weighted average share price	$	107.27	$	74.08