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Condensed Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Other property and equipment, accumulated depreciation | $ 59,720 | $ 57,102
Common Stock, par value per share | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 200,000,000 | 200,000,000
Common Stock, Shares, Issued | 112,244,545 | 112,241,966
Common Stock, Shares, Outstanding | 112,244,545 | 112,241,966

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