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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Total current assets | $ 785,570 | $ 753,313 |
Deferred financing costs | 6,616 | 7,149 |
Deferred income taxes - noncurrent | 908 | 36,995 |
Total assets | 1,248,606 | 1,213,336 | $ 1,095,900
Long-term debt | 344,589 | 294,266 |
Total liabilities and stockholders' equity | $ 1,248,606 | 1,213,336 |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Deferred income taxes - current |  | 0 |
Total current assets |  | 753,313 |
Deferred financing costs |  | 0 |
Deferred income taxes - noncurrent |  | 36,995 |
Total assets |  | 1,213,336 |
Long-term debt |  | 294,266 |
Total liabilities and stockholders' equity |  | 1,213,336 |
Scenario, Previously Reported [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Deferred income taxes - current |  | 20,311 |
Total current assets |  | 773,624 |
Deferred financing costs |  | 7,149 |
Deferred income taxes - noncurrent |  | 16,684 |
Total assets |  | 1,220,485 |
Long-term debt |  | 301,415 |
Total liabilities and stockholders' equity |  | $ 1,220,485 |

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