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Financial Instruments - Effect on Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Amount of gain (loss) recognized in OCI on derivatives |  |
Amount of gain (loss) recognized in OCI on derivatives | $ 2,905 | $ (2,846)
Amount of gain (loss) reclassified from AOCI into income |  |
Amount of gain (loss) reclassified from AOCI into income | (7) | 16
Interest rate caps |  |
Amount of gain (loss) recognized in OCI on derivatives |  |
Amount of gain (loss) recognized in OCI on derivatives | 2,852 | (2,311)
Interest rate caps | Interest expense |  |
Amount of gain (loss) reclassified from AOCI into income |  |
Amount of gain (loss) reclassified from AOCI into income | (35) | (2)
Natural gas swaps |  |
Amount of gain (loss) recognized in OCI on derivatives |  |
Amount of gain (loss) recognized in OCI on derivatives | 53 | (535)
Natural gas swaps | Cost of goods sold |  |
Amount of gain (loss) reclassified from AOCI into income |  |
Amount of gain (loss) reclassified from AOCI into income | $ 28 | $ 18

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