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Reportable Operating Segments - Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
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Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets |  |  |  |
Cash and cash equivalents | $ 493,002 | $ 291,764 | $ 296,428 | $ 245,956
Deferred tax assets | 33,612 | 44,708 |  |
Total assets | 1,530,963 | 1,191,780 |  |
Reportable segments |  |  |  |
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets |  |  |  |
Total assets | 790,231 | 606,058 |  |
Unallocated overhead costs |  |  |  |
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets |  |  |  |
Cash and cash equivalents | 493,002 | 291,764 |  |
Deferred tax assets | 33,612 | 44,708 |  |
Other unallocated corporate assets | $ 214,118 | $ 249,250 |  |

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