Significant Accounting Policies (Detail Textuals) (USD $)	1 Months Ended	12 Months Ended				12 Months Ended
	Jan. 24, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jan. 22, 2013 Subsequent Event	Dec. 31, 2012 Customer concentration risk Revenue Customer	Dec. 31, 2011 Customer concentration risk Revenue Customer	Dec. 31, 2010 Customer concentration risk Revenue Customer	Dec. 31, 2012 Customer concentration risk Accounts receivable Customer	Dec. 31, 2011 Customer concentration risk Accounts receivable Customer
Class of Stock [Line Items]
Common Stock, par value (in dollars per share)		$ 0.10	$ 0.10
Common stock, shares authorized (in shares)		349,000,000	349,000,000
Preferred Stock, par value (in dollars per share)		$ 0.10	$ 0.10
Preferred Stock, shares authorized (in shares)		1,000,000	1,000,000
Amount of dividend payable in cash per share					$ 0.10
Stock spilt ratio description	Board of Directors authorized a three-for-two stock split by issuance on March 9, 2012 of one additional common share for every two common shares held of record as of February 10, 2012.
Stock split conversion ratio	three-for-two	three-for-two	three-for-two	three-for-two
Customer concentration risk percentage							12.00%	15.00%		19.00%
Number of customers accounted for concentration of credit risk							1	1		1
Description of customers accounted for concentration of credit risk						no customers that accounted for more than 10 percent of revenues	one customer accounted for more than ten percent of the Company's revenues	one customer accounted for more than ten percent of the Company's revenues	no customer accounted for more than 10 percent of accounts receivable	one customer accounted for more than 10 percent of accounts receivable
Customer concentration risk benchmark percentage						more than 10 percent of the Company's revenues	more than 10 percent of the Company's revenues	more than 10 percent of the Company's revenues	more than 10 percent of accounts receivable	more than 10 percent of accounts receivable