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Income Taxes (Details 2) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred tax assets: |  |  |
Federal and state tax attributes | $ 2,227 | $ 0 | $ 13,069
Book/tax depreciation | 9,016 | 6,692 | 19,354
Construction capitalization differences | 0 | 75 | 0
Debt and interest deductions | 0 | 0 | 10,311
Other | 707 | 401 | 0
Total deferred tax assets | 11,950 | 7,168 | 42,734
Valuation allowance | (81) | 0 | (1,310)
Net deferred tax assets | 11,869 | 7,168 | 41,424
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs | 0 | 0 | (3,766)
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates | 0 | 0 | (5,080)
Deferred tax liabilities: |  |  |
Other | (107) | (192) | (305)
Total deferred tax liabilities | (107) | (192) | (9,151)
Net deferred tax asset | $ 11,762 | $ 6,976 | $ 32,273

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