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Income Taxes - Deferred Taxes (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Current deferred tax assets | $ 1,799 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | $ 2,696 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current deferred tax assets | 13,486 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 12,907 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Non-current deferred tax liabilities | (23,297)us-gaap_DeferredTaxLiabilitiesNoncurrent | (25,982)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax assets (liabilities) | $ (8,012)us-gaap_DeferredTaxLiabilities | $ (10,379)us-gaap_DeferredTaxLiabilities

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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