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Stock-Based Compensation Plans (Details 4) (Restricted stock [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Number of Restricted Shares, Beginning balance	1,244,864	1,034,139	647,994
Number of Restricted Shares, Granted	435,548	549,264	659,520
Number of Restricted Shares, Performance share pay-out	130,552	206,664
Number of Restricted Shares, Cancelled	(279,081)	(71,152)	(500)
Number of Restricted Shares, Vested	(574,172)	(474,051)	(272,875)
Number of Restricted Shares, Ending balance	957,711	1,244,864	1,034,139
Weighted average exercise price, Balance	$ 15.69	$ 11.23	$ 9.64	$ 12.14

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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