Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Stockholders' Equity

Summary of stock compensation amounts recognized in the consolidated statements of comprehensive income

	Year Ended December 31,
	2012			2011			2010
Compensation expense recorded for:
NSUs	$	11,849		$	11,719		$	7,915
SARs		1,501			1,813			3,420
RSUs		231			305			677
Directors' shares		1,080			966			770
Total compensation expense		14,661			14,803			12,782
Income tax benefit recognized		(5,573	)		(5,788	)		(5,127	)
Net compensation expense	$	9,088		$	9,015		$	7,655

Summary of the total remaining unrecognized compensation cost related to nonvested awards, that are considered probable of vesting and the weighted-average period over which the cost is expected to be recognized

	Unrecognized Compensation Cost		Weighted-Average Remaining Vesting Period (Years)
NSUs	$	6,780		0.6
SARs		4,883		3.2
RSUs		750		3.2
Total	$	12,413

Summary of Nonvested Stock Units Issued Under the 2006 Plan

	Number of Shares			Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2010		717,000		$	26.34
Granted		315,000			45.99
Vested		(208,000	)		22.83
Forfeited		(26,000	)		25.98
Nonvested at December 31, 2010		798,000		$	35.61
Granted		199,000			87.50
Vested		(263,000	)		40.31
Forfeited		(57,000	)		46.61
Nonvested at December 31, 2011		677,000		$	48.14
Granted		209,000			63.18
Vested		(297,000	)		35.90
Forfeited		(18,000	)		63.68
Cancelled*		(200,000	)		62.17
Nonvested at December 31, 2012		371,000		$	58.51

*

Nonvested Stock Units cancelled during the period represent awards granted whose performance criteria were not met.

Summary of Stock Appreciation Rights Issued Under the 2006 Plan

	Number of SARs			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at January 1, 2010		1,200,000		$	26.73		9.8	$	8,608
Granted		—			—
Exercised		—			—
Forfeited		(75,000	)		26.73
Outstanding at December 31, 2010		1,125,000		$	26.73		8.7	$	59,636
Granted		—			—
Exercised		(365,000	)		26.73
Forfeited		—			—
Outstanding at December 31, 2011		760,000		$	26.73		8.8	$	37,118
Granted		—			—
Exercised		(15,000	)		26.73
Forfeited		—
Outstanding at December 31, 2012		745,000		$	26.73		7.9	$	10,087
Exercisable at December 31, 2012		220,000		$	26.73		4.4	$	2,979
Expected to vest and exercisable at December 31, 2012		707,945		$	26.73		7.8	$	9,586

Summary of Restricted Stock Units Issued Under the 2006 Plan

	Number of Shares			Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2010		159,000		$	26.73
Granted		—			—
Vested		(64,000	)		26.73
Forfeited		(10,000	)		26.73
Nonvested at December 31, 2010		85,000		$	26.73
Granted		275,000			82.09
Vested		(16,000	)		26.73
Forfeited		(25,000	)		82.09
Nonvested at December 31, 2011		319,000		$	70.15
Granted		352,000			56.12
Vested		—			—
Forfeited		—			—
Nonvested at December 31, 2012		671,000		$	62.80