Stock-Based And Long-Term Compensation (Narrative) (Details) (USD $)	12 Months Ended			24 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2012 Supplemental Executive Retirement Plan [Member]	Dec. 31, 2011 Supplemental Executive Retirement Plan [Member]	Dec. 31, 2010 Supplemental Executive Retirement Plan [Member]	Sep. 30, 2012 Non-Qualified Deferred Compensation Plans [Member]	Dec. 31, 2012 Non-Qualified Deferred Compensation Plans [Member]	Dec. 31, 2011 Non-Qualified Deferred Compensation Plans [Member]	Dec. 31, 2010 Non-Qualified Deferred Compensation Plans [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member] employee	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member] employee	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Performance Shares [Member]	Dec. 31, 2011 Performance Shares [Member]	Dec. 31, 2010 Performance Shares [Member]	Dec. 31, 2012 Employee Stock Purchase Plan [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member]	Dec. 31, 2010 Employee Stock Purchase Plan [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Maximum employee contribution to be matched by employer	4			5
Stock options granted												78,043
Share-based payment vesting period, years												3 years			3 years
Share-based payment expiration period, years												10 years
Compensation expense					$ 2,400,000	$ 1,800,000	$ 5,600,000					$ 4,800,000	$ 3,300,000	$ 15,500,000	$ 17,000,000	$ 6,000,000	$ 11,400,000	$ 2,400,000	$ 1,200,000	$ 1,200,000	$ 11,900,000	$ 3,200,000	$ 5,200,000	$ 500,000	$ 400,000	$ 300,000
Number of option modified affecting employees related to management transition														1,418,395			282,781
Number of employees affected in connection with management transition														3			3
Incremental compensation cost related to options														9,800,000			4,300,000
Intrinsic value of options exercised												40,400,000
Cash received from exercising options												14,800,000	10,300,000	900,000
Tax benefit from exercising stock options												600,000	7,400,000	600,000	1,000,000
Unrecognized compensation expense related to non-vested options oustanding												4,000,000			26,100,000
Compensation expense expected to recognize In 2013												2,400,000			14,000,000
Compensation expense expected to recognize in 2014												1,600,000			10,200,000
Compensation expense expected to recognize in 2015															2,000,000
Resticted stock granted															362,904			86,758
Shares outstanding															1,296,893	1,039,717		257,215	170,457		295,965
Performance period of PSU grant, years																					3 years
Portion of equivalent value in common stock of company after meeting service requirements, at discretion of compensation committee																					50.00%
Issue of common stock to employees																					43,300	67,300
Cash paid to settle performance share units																					2,700,000	2,800,000	6,400,000
Performance Share Units Outstanding, in 2013																					94,562
Performance Share Units Outstanding, in 2014																					74,024
Performance Share Units Outstanding, in 2015																					127,379
Shares issued under Employee Stock Purchase Plan, shares																								147,000	75,700	94,200
Proceed from issue of shares under employee stock purchase plans	2,855,000	2,206,000	1,891,000																					2,900,000	2,200,000	1,900,000
Common stock reserved for issuance																								1,000,000
Maximum empoyee contribution	75.00%
Company contribution, percent	100.00%
Company discretionary contributions	8,400,000	7,400,000	3,300,000				4,700,000
Maximum portion of base salary to defer under non-qualified deferred compensation plan								75.00%
Maximum portion of bonus to defer under non-qualified deferred compensation plan									100.00%
Non-employee cash deferred to non-qualified compensation plan								100.00%
Maximum of cash portion of PSU compensation to defer under non-qualified deferred compensation plan									100.00%
Non-employee RSU deferred to non-qualified compensation plan									100.00%
Long-term liability									13,500,000	13,000,000
Current liability									100,000	2,800,000
Deferred compensation, compensation expense									1,600,000	100,000	(1,800,000)
Deferred compensation plan assets									11,300,000	10,600,000
Other income (expense)									(700,000)	(200,000)	800,000
Employers Contribution to be received by plan participants, Minimum					5.00%
Employers Contribution to be received by plan participants, Maximum					35.00%
Employers contribution					1,800,000	1,000,000	5,500,000
Distribution to select participants					$ 6,700,000	$ 5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	2,668,046,000											2,668,046
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Other															609,743
Share-based Compensation Arrangement by Share-based Payment Award, Other Share Increase (Decrease)															609,743