Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Stockholders' Equity

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

	Year Ended December 31,
	2011			2010			2009
Compensation expense recorded for:
NSUs	$	11,719		$	7,915		$	5,652
SARs		1,813			3,420			5,287
RSUs		305			677			994
Directors' shares		966			770			1,083
Total compensation expense		14,803			12,782			13,016
Income tax benefit recognized		(5,788	)		(5,127	)		(5,096	)
Net compensation expense	$	9,015		$	7,655		$	7,920

Summary of the total remaining unrecognized compensation cost related to nonvested awards and the weighted-average period over which the cost is expected to be recognized

	Unrecognized Compensation Cost		Weighted-Average Remaining Vesting Period (Years)
NSUs	$	18,813		1.4
SARs		6,384		4.2
RSUs		981		4.2
Total	$	26,178

Summary of Nonvested Stock Units Issued Under the 2006 Plan

	Number of Shares			Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2009		744,000		$	23.52
Granted		291,000			17.80
Vested		(288,000	)		10.42
Forfeited		(30,000	)		26.34
Nonvested at December 31, 2009		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

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, 2009		1,200,000		$	26.73		10.8	$	—
Granted		—			—
Exercised		—			—
Forfeited		—			—
Outstanding at December 31, 2009		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
Exercisable at December 31, 2011		115,000		$	26.73		5.4	$	5,617
Expected to vest and exercisable at December 31, 2011		704,000		$	26.73		8.7	$	34,381

Summary of Restricted Stock Units Issued Under the 2006 Plan

	Number of Shares			Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2009		159,000		$	26.73
Granted		—			—
Vested		—			—
Forfeited		—			—
Nonvested at December 31, 2009		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