Net Deferred Tax Assets (Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Disclosure Net Deferred Tax Assets Liabilities [Abstract]
Current deferred tax assets	$ 20,473	$ 41,237
Current deferred tax liabilities	(3,337)	(1,771)
Net current deferred tax assets	17,136	39,466
Non-current deferred tax assets	110,762	108,205
Non-current deferred tax liabilities	(170,886)	(177,563)
Net non-current deferred tax liabilities	(60,124)	(69,358)
Net deferred tax liabilities	$ (42,988)	$ (29,892)

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

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

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- Definition

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- Definition

Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

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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