Stock Option Plans and Restricted Stock Grants (Details Textual) (USD $)	12 Months Ended				5 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Common Stock [Member]	May 31, 2008 Equity Incentive Plan 2008 [Member]	Dec. 31, 2011 Equity Incentive Plan 2008 [Member]	Dec. 31, 2011 Stock Option Plan 2000 [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2011 2008 Equity Incentive Plan Restricted stock [Member]	Dec. 31, 2011 Restricted Stock [Member]
Stock Option Plans and Restricted Stock Grants (Textual) [Abstract]
Authorized to Issuance of Equity Incentive Plan					3,949,891
Expiry of Equity Incentive Plan						2018
Outstanding options under 2000 Stock Option Plan	2,865,000	2,949,000					1,276,807
Total expenses on stock option	$ 1,100,000	$ 1,400,000	$ 1,700,000
Stock options granted	31,000	397,000	936,000
Weighted-average grant-date fair value of options granted	$ 3.07	$ 2.76	$ 2.88
Intrinsic value of options exercised	20,000	1,200,000	147,000
Forfeiture rate for 2010		6.00%
Weighted-average period for expected cost recognized	2.17
Fair value of options vested	1,500,000	1,500,000	1,400,000
Cash received from stock option exercises	59,000	1,500,000	280,000
Numbers of common shares outstanding options for purchase	104,482,271	106,075,576						2,865,307
Number of common shares for which options are exercisable	1,921,000			1,921,207
Options exercisable lower price range	$ 6.11
Options exercisable upper price range	$ 15.53
2008 Equity Incentive Plan, granted restricted stock awards									170,000
Weighted average fair value of restricted stock									$ 8.19
Period of compensation cost recognized	5 years
Amount of compensation cost recognized	1,100,000	775,000	403,000
Unrecognized compensation cost related to nonvested options granted	$ 1,000,000									$ 994,000
Common stock available for the granting of future options and restricted stock	1,865,524