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Net Deferred Tax Assets (Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Disclosure Net Deferred Tax Assets Liabilities [Abstract]    
Current deferred tax assets $ 37,538 $ 20,473
Current deferred tax liabilities 0 (3,337)
Net current deferred tax assets 37,538 17,136
Non-current deferred tax assets 62,871 110,762
Deferred Tax Liabilities, Gross, Noncurrent 187,769 170,886
Non-current deferred tax liabilities (124,898) (60,124)
Deferred Tax Liabilities, Net $ (87,360) $ (42,988)