Stock-Based Compensation Stock Option Summary (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended					9 Months Ended
		Sep. 30, 2015		Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014
[Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		1 day	[1]		5 years 5 months 14 days		5 years 5 months 15 days	5 years 5 months 15 days
Outstanding, beginning balance, Number				1,151			1,123	1,180
Outstanding, beginning balance, Weighted Average Exercise Price Per Share				$ 51.42			$ 51.90	$ 54.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				4 years 5 months		4 years 7 months 22 days	5 years 4 months 30 days	5 years 1 month 20 days
Outstanding, beginning balance, Aggregate Intrinsic Value	[2]			$ 1,011			$ 1,676	$ 1,300
Options granted, number							207	160
Granted, Weighted Average Exercise Price Per Share							$ 35.30	$ 35.65
Granted, Weighted Average Grant Date Fair Value							$ 12.15	$ 13.65
Exercised, Number							(23)	(41)
Exercised, Weighted Average Exercise Price Per Share							$ 36.05	$ 26.17
Exercised, Aggregate Intrinsic Value	[2]						$ 26	$ 546
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares							(17)	(7)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value							$ 37.47	$ 44.06
Expired, Number							(167)	(141)
Expired, Weighted Average Exercise Price Per Share							$ 53.95	$ 69.24
Outstanding, ending balance, Number		1,123		1,123	1,151	1,180	1,123	1,151
Outstanding, ending balance, Weighted Average Exercise Price Per Share		$ 49.12		$ 51.90	$ 51.42	$ 54.79	$ 49.12	$ 51.42
Outstanding, ending balance, Aggregate Intrinsic Value	[2]	$ 0		$ 1,676	$ 1,011	$ 1,300	$ 0	$ 1,011
Exercisable, Number		739					739
Exercisable, Weighted Average Exercise Price Per Share		$ 55.52					$ 55.52
Exercisable, Weighted Average Remaining Contractual Term							3 years 9 months 20 days
Exercisable, Aggregate Intrinsic Value	[2]	$ 0					$ 0
Expected to Vest [Member]
[Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term							8 years 8 months
Outstanding, ending balance, Number		374					374
Outstanding, ending balance, Weighted Average Exercise Price Per Share		$ 36.86					$ 36.86
Outstanding, ending balance, Aggregate Intrinsic Value	[2]	$ 0					$ 0

[1] (1) There were no employee stock options granted for the three months ended September 30, 2015.

[2] The aggregate intrinsic value of outstanding stock options represents amounts that would have been received by the optionees had all in- the-money options been exercised on that date. Specifically, it is the amount by which the market value of our stock exceeded the exercise price of the outstanding in-the-money options before applicable income taxes, based on our closing stock price on the last business day of the period. The aggregate intrinsic value of stock options exercised during the period is calculated based on our stock price at the date of exercise.