Stock-Based And Long-Term Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Based and Long-Term Compensation (Textual) [Abstract]
Compensation expense	$ 40,181	$ 45,572	$ 44,074
Intrinsic value of options exercised			17,100
Tax benefit from exercising stock options	100	$ 900	$ 5,600
Compensation expense expected to recognize in 2015	16,600
Compensation expense expected to recognize in 2016	7,300
Compensation expense expected to recognize in 2017	$ 300
Shares issued under Employee Stock Purchase Plan, shares	290,987	332,467	246,480
Proceed from issue of shares under employee stock purchase plans	$ 3,681	$ 4,803	$ 4,870
Long-term liability	18,489	17,367
Current liability	1,115	721
Deferred compensation, compensation expense	1,400	2,100	1,600
Deferred compensation plan assets	12,360	11,548
Other income (expense)	$ 22,621	(9,476)	(7,681)
Employee Stock Option [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Share-based payment vesting period, years	3 years
Share-based payment expiration period, years	10 years
Compensation expense	$ 4,870	3,663	3,900
Intrinsic value of options exercised	300	2,300
Cash received from exercising options	500	8,800	10,600
Tax benefit from exercising stock options	1,802	1,355	1,443
Unrecognized compensation expense related to non-vested options oustanding	5,700
Compensation expense expected to recognize in 2015	3,300
Compensation expense expected to recognize in 2016	2,400
Restricted Stock [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Compensation expense	382	9,219	15,800
Tax benefit from exercising stock options	$ 141	$ 3,411	5,846
Shares outstanding		292,937
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 23.13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 23.13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 6,800	$ 12,100	23,000
Restricted Stock Units (RSUs) [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Compensation expense	24,762	19,699	11,282
Tax benefit from exercising stock options	9,162	$ 7,289	4,174
Unrecognized compensation expense related to non-vested options oustanding	$ 24,200
Resticted stock granted	2,549,112
Shares outstanding	3,686,292	2,787,889
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 20.62
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 14.10	$ 20.41
Performance Shares [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Compensation expense	$ 10,167	$ 12,991	13,092
Shares outstanding	368,394
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%
Performance Share Units Outstanding, in 2014	121,168
Performance Share Units Outstanding, in 2015	129,852
Performance Share Units Outstanding, in 2016	117,374
2013 Employee Stock Purchase Plan Member
Stock Based and Long-Term Compensation (Textual) [Abstract]
Compensation expense	$ 1,492	835	1,078
Supplemental Executive Retirement Plan [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Employers Contribution to be received by plan participants, Minimum	5.00%
Employers Contribution to be received by plan participants, Maximum	35.00%
Employers contribution	$ 2,200	1,200	1,200
Distribution to select participants	$ 1,400	3,700	3,000
Other Pension Plan [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
Maximum employee contribution to be matched by employer	4.00%
Maximum empoyee contribution	75.00%
Company contribution, percent	100.00%
Company discretionary contributions	$ 8,700	$ 13,900	$ 16,700
Non-Qualified Deferred Compensation Plans [Member]
Stock Based and Long-Term Compensation (Textual) [Abstract]
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%