Quarterly report pursuant to Section 13 or 15(d)

Income Tax Benefit (Expense) - Additional Information (Detail Textuals)

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Income Tax Benefit (Expense) - Additional Information (Detail Textuals) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]          
Income tax benefit due to election of another acceptable tax method   $ 11,100,000      
Income tax expense, net 2,502,000   7,933,000 (3,761,000) 11,177,000
Income tax expense benefit due to change in tax status         4,200,000
Income tax expense benefit due to prepayments of debt         2,600,000
Income tax expense benefit due to expense from U.S. operations         9,600,000
Income tax expense benifit due to interest and depreciation deductions         $ 5,300,000