Shareholders' Equity (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Shareholders' equity (Textual) [Abstract]
Common Stock issued	0	0	0	0
Share-based compensation expense was capitalized in inventory or any other assets			$ 828,000	1,757,000
Expiry period of options and stock appreciation rights from the date of grant			10 years
Shareholders equity (Additional Textual) [Abstract]
Options Granted, Shares			597,015
Additional shares under incentive plan	1,750,000		1,750,000
Maximum [Member]
Shareholders' equity (Textual) [Abstract]
Equity awards vested over a period			5 years
Minimum [Member]
Shareholders' equity (Textual) [Abstract]
Equity awards vested over a period			3 years
Capitalized In Inventory or Other Assets [Member]
Shareholders' equity (Textual) [Abstract]
Share-based compensation expense was capitalized in inventory or any other assets	0	0	0	0
Stock Options [Member]
Shareholders' equity (Textual) [Abstract]
Common Stock reserved for issuance	415,575		415,575		446,975
Stock options, vested	32,000		32,000
Unrecognized compensation cost	200,000		200,000
Unrecognized weighted average period	1 year 3 months 18 days		1 year 3 months 18 days
Granted, Shares
Aggregate intrinsic value unvested and vested outstanding stock options	0		0		0
SARs Exercised, Shares	0	0	0	0
Shareholders equity (Additional Textual) [Abstract]
Options Granted, Shares
SARs granted [Member]
Shareholders' equity (Textual) [Abstract]
Common Stock reserved for issuance	1,632,635		1,632,635		787,690
Unrecognized compensation cost	2,300,000		2,300,000
Unrecognized weighted average period	3 years 7 months 6 days		3 years 7 months 6 days
Granted, Shares	668,265	97,500	975,015	182,500
Aggregate intrinsic value unvested and vested outstanding stock options	121,983		121,983		81,500
SARs Exercised, Shares	0	0		1,100
SARs Vested	42,900		102,950
Period of grant			10 years
Option remaining outstanding range minimum			30 days
Option remaining outstanding range maximum			90 days
Expected term (years)			5 years	4 years 6 months
Shareholders equity (Additional Textual) [Abstract]
Options Granted, Shares			975,015
SARs granted [Member] | Maximum [Member]
Shareholders' equity (Textual) [Abstract]
Equity awards vested over a period			5 years
SARs granted [Member] | Minimum [Member]
Shareholders' equity (Textual) [Abstract]
Equity awards vested over a period			0 years
Restricted Stock [Member]
Shareholders' equity (Textual) [Abstract]
Unvested restricted stock outstanding	1,880		1,880		2,720
Unrecognized compensation cost	10,300		10,300
Unrecognized weighted average period	2 months 12 days		2 months 12 days
Granted, Shares
Equity awards vested over a period			5 years
Restricted Stock [Member] | Maximum [Member]
Shareholders' equity (Textual) [Abstract]
Restricted stock grants at fair value, minimum	$ 14.90		$ 14.90
Restricted Stock [Member] | Minimum [Member]
Shareholders' equity (Textual) [Abstract]
Restricted stock grants at fair value, maximum	$ 16.77		$ 16.77
Restricted Stock Units [Member]
Shareholders' equity (Textual) [Abstract]
Restricted stock, issued	25,000	34,000	127,250	54,000
Unrecognized compensation cost	800,000		800,000
Unrecognized weighted average period	3 years 4 months 24 days		3 years 4 months 24 days
Granted, Shares			127,250
Period of grant			5 years
2009 ESPP [Member]
Shareholders' equity (Textual) [Abstract]
Common Stock reserved for issuance under the share based plan			200,000
Common Stock reserved for issuance	6,663		6,663
Percentage of Employee Stock Purchase Plan Eligibility criteria			10.00%
Minimum Fair value of common stock	$ 25,000		$ 25,000
Minimum number of shares purchased by employee	25,000		25,000
Percentage of closing market price of common stock			85.00%
Expected term (years)			1 year
Equity Incentive Plan [Member]
Shareholders' equity (Textual) [Abstract]
Common Stock reserved for issuance under the share based plan			1,500,000
Shares available for issuance	977,486		977,486
Restricted stock, issued	0	0	0	0