Stockholders' Equity (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Apr. 11, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity (Textual) [Abstract]
Stock Option, Vesting period		3 years
Compensation expense, recognition period		1 year 9 months 18 days
Performance-based awards outstanding		747,500,000	796,500,000
Stock-based compensation expense		$ 2,166	$ 2,012	$ 2,047
Fair value of options vested		1,239	1,213	590
Stockholders' Equity (Additional Textual) [Abstract]
Issuance of common stock	4,000,000
Common stock, price per share	$ 13.00
Common stock, shares authorized to the underwriters	600,000
Exercise period given to the underwriters	30 days
Common stock, shares authorized purchased by the underwriters	600,000	18,244,179	13,419,872
Net proceeds from the issuance of common stock	56,300	56,566		41
Shares available for future grants Under 2004 Incentive Stock Plan		1,317,184
Total unrecognized compensation cost		3,325
Expiration period from grant date		10 years
Options granted
Estimated forfeiture rate used for recording stock-based compensation expense		5.00%
Exercised, Aggregate Intrinsic Value		245		2
Cash received from the options exercised		305		42
Cash tax benefits realized from stock awards exercised		93		42
Options exercised during 2011		39,000,000	0
Vice President [Member]
Stockholders' Equity (Textual) [Abstract]
Stock Option, Vesting period		90 days
Stock-based compensation expense		115
Executive Vice President [Member]
Stockholders' Equity (Textual) [Abstract]
Stock-based compensation expense			222
Performance Shares [Member]
Stockholders' Equity (Textual) [Abstract]
Stock Option, Vesting period		3 years
Performance-based awards outstanding		262,803
Restricted Stock Units (RSUs) [Member]
Stockholders' Equity (Textual) [Abstract]
Fair value of options vested		$ 990	$ 296	$ 3,238
Minimum [Member]
Stockholders' Equity (Textual) [Abstract]
Stock Option, Vesting period		1 year
Compensation expense, recognition period		1 year
Maximum [Member]
Stockholders' Equity (Textual) [Abstract]
Stock Option, Vesting period		3 years
Compensation expense, recognition period		3 years