Income Tax (Details Textuals) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Liability Not Recognized [Line Items]
Deferred Tax Liabilities, Noncurrent	$ 133,555,000	$ 85,187,000
Deferred Tax Liabilities, Net, Current	(7,075,000)	(501,000)
Unrecognized Tax Benefits, Income Tax Penalties Expense	2,600,000
Lig [Member]
Deferred Tax Liability Not Recognized [Line Items]
Deferred Tax Liabilities, Noncurrent	$ 6,000,000

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

This element represents the recognized expense for the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties or, if not recognizing the expense in the period in which the tax return was initially filed, the expense is generally recognized in the period in which the enterprise's judgment about meeting the minimum statutory threshold changes.

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