Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Computation Of Basic And Diluted Net Income (Loss) Per Share

	December 31,
	2011		2010			2009
Numerator:
Net income (loss)	$	65,135	$	(27,833	)	$	(4,334	)
Denominator:
Weighted average common stock outstanding (basic)		41,269,767		40,322,939			39,524,544
Common equivalent shares from options to purchase common stock, restricted common stock units and performance stock units		1,256,856		—			—
Weighted average common stock outstanding (diluted)		42,526,623		40,322,939			39,524,544
Basic net income (loss) per share	$	1.58	$	(0.69	)	$	(0.11	)
Diluted net income (loss) per share	$	1.53	$	(0.69	)	$	(0.11	)

Securities Excluded From Computation Of Diluted Earnings Per Share

	December 31,
	2011		2010		2009
Stock options		1,302,471		4,815,508		4,292,789
Restricted stock units		72,956		804,895		629,041
Performance stock units		79,402		48,240		—
Total antidilutive awards		1,454, 829		5,668,643		4,921,830

Summary Of Stock-Based Compensation Expense

	December 31,
	2011		2010		2009
Stock options	$	4,941	$	5,732	$	10,535
Restricted common stock (1)		321		1,670		4,599
Restricted stock units		5,293		3,354		1,855
Performance stock units (2)		1,057		477		—
Total stock-based compensation expense (3)	$	11,612	$	11,233	$	16,989

(1) Awards granted under the Long-Term Incentive Plan (LTIP) consisted of restricted common stock. Each individual's total award was allocated 50% to achieving earnings before interest, taxes, depreciation and amortization (EBITDA Performance Award) and 50% to the market value of our common stock (Market Value Award). For further information regarding our stock-based compensation plans, please refer to Note 12.

Schedule Of Unamortized Stock-Based Compensation Expense And Weighted Average Remaining Amortization Period

	Unamortized Stock -Based Compensation Expense (in thousands)		Weighted Average Remaining Amortization Period (in years)
Stock options	$	8,955		2.71
Restricted stock units	$	11,525		2.61
Performance stock units	$	2,099		1.59

Assumptions Used To Estimate Fair Value Of Share-Based Award

	December 31,
	2011			2010			2009
Expected volatility		49.5	%		50.3	%		48.6– 51.6	%
Expected dividend yield		0	%		0	%		0	%
Expected life (in years)		4.10			4.18			4.18– 4.47
Risk-free interest rate		0.67– 1.63	%		0.94– 1.91	%		1.62– 2.12	%
Weighted-average fair value of stock options granted	$	8.36		$	6.32		$	5.79
Weighted-average fair value of restricted common stock granted		—			—		$	15.43
Weighted-average fair value of restricted stock units granted	$	20.30		$	15.30		$	12.03

Performance Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary Of Stock-Based Compensation Expense

	December 31,
	2011		2010
ANI Performance Awards	$	452	$	157
TSR Performance Awards		605		320
Total	$	1,057	$	477

ANI And TSR Performance Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumptions Used To Estimate Fair Value Of Share-Based Award

	December 31,
	2011			2010
Expected volatility		49.5	%		50.3	%
Expected dividend yield		0	%		0	%
Expected life (in years)		4.10			4.18
Risk-free interest rate		1.16	%		1.33	%
Weighted-average fair value of ANI Performance Award	$	19.48		$	16.91
Weighted-average fair value of TSR Award	$	21.27		$	17.62

EBITDA Performance Award And Market Value Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumptions Used To Estimate Fair Value Of Share-Based Award

	December 31,
	2011		2010		2009
EBITDA Performance Award	$	—	$	40	$	486
Market Value Award		—		45		258
Total	$	—	$	85	$	744