Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			72 Months Ended	84 Months Ended	12 Months Ended							12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013 Stock Options Plans [Member]	Dec. 31, 2012 Stock Options Plans [Member]	Dec. 31, 2011 Stock Options Plans [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	May 16, 2007 2012 Long-term Incentive Plan [Member] Maximum [Member]	Dec. 31, 2013 Two Thousand Seven Incentive Plan [Member]	May 09, 2012 Two Thousand Seven Incentive Plan [Member]	Dec. 31, 2013 Two Thousand Seven Incentive Plan [Member] Maximum [Member] Stock Options Plans [Member]	Dec. 31, 2013 Two Thousand Seven Incentive Plan [Member] Maximum [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Two Thousand Seven Incentive Plan [Member] Minimum [Member] Stock Options Plans [Member]	Dec. 31, 2013 Two Thousand Seven Incentive Plan [Member] Minimum [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Treasury Stock [Member]	Dec. 31, 2012 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 31, 2013 Two Thousand Seven Incentive Plan [Member]
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Number of common stock reserved for issuance												3,200,000		3,200,000
Expiration year	Dec. 31, 2022												Dec. 31, 2007
Vesting period (years)															5 years	5 years	3 years	3 years
Option awards contractual term (years)													10 years									10 years
Weighted average remaining life	4 years 4 months 24 days					1 year 1 month 6 days
Common stock to non-employee directors																			3,000	2,000	3,000
Stock repurchase program authorized share amount	15,000,000				15,000,000
Common stock repurchased, shares	1,000	0	0		11,519,000
Treasury Stock Acquired, Average Cost Per Share	$ 123.16
Common stock repurchased, value				$ 335,236
Weighted-average grant-date fair value of options granted	$ 0.00	$ 28.71	$ 25.39
Total intrinsic value of options exercised	20,101	4,226	1,148
Recognized stock-based compensation costs						1,366	2,176	1,885	16,945	11,887	4,262
Recognized stock-based compensation costs, net of tax						865	1,378	1,194	10,735	7,530	2,700
Pre-tax unrecognized compensation expense	$ 30,124				$ 30,124	$ 992
Recognized expense over a weighted-average period, years	2 years 7 months 6 days