Schedule of Changes in SARs (Details) (USD $)	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	The SARs vest ratably over a three-year period and may be exercised at any point after vesting through 10 years from the date of issuance. Pursuant to the terms of the awards, upon exercise, the executive officers will receive, in shares of common stock, the excess of the market price of the award on the date of exercise over the market price of the award on the date of issuance.
Stock Appreciation Rights (SARs)
Number of SARs
Outstanding beginning of year, January 1,	190,763	118,832
Awarded	88,248	87,078
Outstanding at September 30,	279,011	205,910
Vested and expected to vest at September 30,	270,589	198,163
Exercisable at September 30,	109,920	67,069
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Outstanding beginning of year, January 1,	$ 33.77	$ 30.80
Awarded	$ 49.57	$ 37.18
Outstanding at September 30,	$ 38.77	$ 33.50
Vested and expected to vest at September 30,	$ 38.56	$ 33.41
Exercisable at September 30,	$ 32.71	$ 29.99
Weighted-Average Remaining Contractual Term (in years)
Outstanding beginning of year, January 1,	8 years 0 months 18 days	8 years 4 months 15 days
Outstanding at September 30,	8 years 0 months 18 days	8 years 4 months 15 days
Vested and expected to vest at September 30,	8 years 0 months 11 days	8 years 4 months 15 days
Exercisable at September 30,	7 years 1 month 0 days	7 years 4 months 0 days
Share based compesation aggregate intrinsic value
Outstanding beginning of year, January 1,	$ 3,215,000	$ 5,363,000
Outstanding at September 30,	3,215,000	5,363,000
Vested and expected to vest at September 30,	3,173,000	5,178,000
Exercisable at September 30,	1,933,000	1,982,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 3,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 10 months 7 days

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