Stock-Based Compensation Stock Option Summary (Details) (Employee Stock Option [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Sep. 30, 2014		Sep. 30, 2013
[Line Items]
Outstanding, beginning balance, Number	1,201				1,180		1,137
Outstanding, beginning balance, Weighted Average Exercise Price Per Share	$ 54.32				$ 54.79		$ 54.06
Outstanding, beginning balance, Weighted Average Remaining Contractual Term	4 years 7 months 22 days		4 years 9 months 21 days		5 years 1 month 10 days		4 years 9 months 2 days
Outstanding, beginning balance, Aggregate Intrinsic Value	$ 2,090	[1]			$ 1,300	[1]	$ 3,815	[1]
Options granted, number					160		128
Granted, Weighted Average Exercise Price Per Share					$ 35.65		$ 42.76
Granted, Weighted Average Grant Date Fair Value					$ 13.65		$ 15.44
Exercised, Number					(41)		(53)
Exercised, Weighted Average Exercise Price Per Share					$ 26.17		$ 22.40
Exercised, Aggregate Intrinsic Value					546	[1]	1,067	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					7
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price					$ 44.06
Expired, Number					(141)		(11)
Expired, Weighted Average Exercise Price Per Share					$ 69.24		$ 49.04
Outstanding, ending balance, Number	1,180		1,137		1,151		1,201
Outstanding, ending balance, Weighted Average Exercise Price Per Share	$ 54.79		$ 54.06		$ 51.42		$ 54.32
Outstanding, ending balance, Weighted Average Remaining Contractual Term	4 years 7 months 22 days		4 years 9 months 21 days		5 years 1 month 10 days		4 years 9 months 2 days
Outstanding, ending balance, Aggregate Intrinsic Value	1,300	[1]	3,815	[1]	1,011	[1]	2,090	[1]
Exercisable, Number					797
Exercisable, Weighted Average Exercise Price Per Share					$ 56.78
Exercisable, Weighted Average Remaining Contractual Term					3 years 4 months 15 days
Exercisable, Aggregate Intrinsic Value					396	[1]
Expected to Vest [Member]
[Line Items]
Outstanding, beginning balance, Weighted Average Remaining Contractual Term					8 years 8 months 20 days
Outstanding, ending balance, Number					341
Outstanding, ending balance, Weighted Average Exercise Price Per Share					$ 39.40
Outstanding, ending balance, Weighted Average Remaining Contractual Term					8 years 8 months 20 days
Outstanding, ending balance, Aggregate Intrinsic Value					$ 586	[1]

[1] 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.