Schedule of Changes in SARs (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
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 ten 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,	326,453	279,011
Awarded	58,709	68,274
Outstanding at June 30,	244,078	347,285
Vested and expected to vest at June 30,			238,671	341,423
Exercisable at June 30,			136,644	191,149
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Outstanding beginning of year, January 1,	$ 38.99	$ 38.77
Awarded	51.63	39.63
Outstanding at June 30,	$ 41.36	$ 38.94
Vested and expected to vest at June 30,			$ 41.20	$ 38.89
Exercisable at June 30,			$ 36.74	$ 35.68
Weighted-Average Remaining Contractual Term (in years)
Outstanding at June 30,	7 years 1 month 19 days	7 years 6 months
Vested and expected to vest at June 30,	7 years 1 month 7 days	7 years 6 months
Exercisable at June 30,	5 years 10 months 23 days	6 years 7 months
Share based compesation aggregate intrinsic value
Outstanding beginning of year, January 1,	$ 6,273	$ 4,888	$ 6,273	$ 4,888
Outstanding at June 30,	$ 6,273	$ 4,888
Vested and expected to vest at June 30,			6,171	4,821
Exercisable at June 30,			4,143	$ 3,312
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 1,700
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 10 months 19 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	(141,084)	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 40.16	$ 0.00
Share based exercised awards intrinsic value	$ 2,770

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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