Schedule of Changes in SARs (Details) (USD $)	6 Months Ended	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
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,	118,832	50,471	50,471
Awarded	87,078	68,361
Outstanding at June 30,	205,910	118,832	118,832	50,471
Vested and expected to vest at June 30,	196,421	112,285
Exercisable at June 30,	67,069	27,458
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Outstanding beginning of year, January 1,	$ 30.80	$ 31.61	$ 31.61
Awarded	$ 37.18	$ 30.19
Outstanding at June 30,	$ 33.50	$ 30.80	$ 30.80	$ 31.61
Vested and expected to vest at March 31,	$ 33.40	$ 30.76
Exercisable at June 30,	$ 29.99	$ 28.84
Weighted-Average Remaining Contractual Term (in years)
Outstanding at June 30,	8 years 7 months 6 days	8 years 10 months 24 days	8 years 4 months 24 days	8 years 7 months 6 days
Vested and expected to vest at June 30,	8 years 7 months 6 days	8 years 10 months 24 days
Exercisable at June 30,	7 years 7 months 6 days	8 years 0 months 0 days
Share based compesation aggregate intrinsic value
Outstanding beginning of year, January 1,	$ 3,703,000	$ 3,000	$ 486,000	$ 341,000
Awarded	0	0
Outstanding at June 30,	3,703,000	3,000	486,000	341,000
Vested and expected to vest at June 30,	3,552,000	3,000
Exercisable at June 30,	1,441,000	2,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 2,200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 12 days

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