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Business and Basis of Presentation (Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expense | $ (21,299) | $ (20,485) | $ (24,034) | $ (23,941) | $ (22,164) | $ (20,820) | $ (21,999) | $ (20,410) | $ (89,759) | $ (85,393) | $ (89,113)
Other (income) expense | $ 164 | $ (218) | $ (335) | $ (87) | $ 273 | $ (387) | $ 432 | $ 74 | (476) | $ 392 | $ (30)
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other (income) expense |  |  |  |  |  |  |  |  | $ 1,000 |  |

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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