Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2013

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

Schedule of information relating to options

The following table sets forth information relating to such options during 2013, 2012, and 2011:

Stock Option Activity	Number Of Shares		Average Exercise Price		Weighted- Average Grant Date Fair Value
Balance, January 1, 2011	4,468,341		$	18.48
Options exercised	(765,693	)	15.76
Options forfeited	(45,369	)	22.30
Options terminated	(7,011	)	8.03
Options granted	1,287,152		42.18		$	15.44
Balance, December 31, 2011	4,937,420		25.08
Options exercised	(1,679,359	)	19.14
Options forfeited	(51,573	)	37.67
Options terminated	(10,995	)	15.74
Options granted	828,991		49.01		16.67
Balance, December 31, 2012	4,024,484		32.33
Options exercised	(1,464,294	)	23.46
Options forfeited	(95,139	)	52.17
Options terminated	(1,381	)	42.26
Options granted	421,385		76.70		19.26
Balance, December 31, 2013	2,885,055		42.60

Schedule of summary of non-vested option activity for the period

The following is a summary of non-vested option activity for the year ended December 31, 2013:

Stock Option Activity	Number Of Shares		Weighted- Average Grant Date Fair Value
Non-vested options outstanding at beginning of year	2,067,673		$	14.90
Granted	421,385		19.26
Vested / exercised	(1,101,080	)	12.83
Forfeited	(105,053	)	16.44
Non vested options outstanding at end of year	1,282,925

Schedule of stock options outstanding and exercisable by exercise price range

A summary of our stock options outstanding and exercisable at December 31, 2013, follows:

Exercise Price Range	Number Outstanding	Number Exercisable	Outstanding Weighted- Average Remaining Contractual Life (Years)	Exercisable Weighted- Average Exercise Price
$0 - $10	253,551	253,551	0.35	$	9.79
$20 - $30	644,916	644,916	1.34	27.75
$30 - $40	11,192	5,794	2.61	37.06
$40 - $50	1,550,004	689,602	2.84	44.07
$60 - $70	24,787	8,267	3.93	66.57
$70 - $80	398,380	—	4.33	—
$80 - $90	2,225	—	4.49	—
	2,885,055	1,602,130

Schedule of the assumptions used for estimating the fair value of stock options granted during the period

The following summarizes the assumptions used for estimating the fair value of stock options granted during 2013, 2012 and 2011, respectively.

	2013	2012	2011
Expected volatility	32.3% - 34.3%	35.8% - 46.4%	46.5% -50.7%
Weighted average expected volatility	33.3%	40.6%	48.7%
Expected term	3.00 - 4.00 years	3.00 - 4.00 years	3.00 - 4.00 years
Risk-free rate	0.61%	0.55%	1.43%
Dividend yield	—%	—%	—%