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Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 02, 2016
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Recent Accounting Pronouncements |  |
Retained earnings | $ (801,999) | $ (747,749)
Accounting Standards Update 2016-16 - Intra-Entity Transfers of Assets Other Than Inventory | Early Adoption, Effect | Low end of range |  |
Recent Accounting Pronouncements |  |
Retained earnings | 0 |
Non-current assets and Deferred tax assets | 0 |
Accounting Standards Update 2016-16 - Intra-Entity Transfers of Assets Other Than Inventory | Early Adoption, Effect | High end of range |  |
Recent Accounting Pronouncements |  |
Retained earnings | 2,500 |
Non-current assets and Deferred tax assets | $ 2,500 |

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