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Net Income (Loss) Attributable to Controlling Interests Per Common Share (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 shares | Dec. 31, 2016 shares | Dec. 31, 2017 USD ($) shares $ / shares | Dec. 31, 2016 USD ($) $ / shares shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Weighted Average Number of Shares, Restricted Stock |  |  |  | 281,282 | 300,478
Document Fiscal Year Focus |  |  |  | 2017 |
Numerator: |  |  |  |  |
Net loss attributable to controlling interests | $ |  |  |  | $ (40,781) | $ (6,335)
Denominator: |  |  |  |  |
Basic (including unvested share-based payment awards) (in shares) | [1] |  |  | 13,925,000 | 13,867,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | [2] |  |  | 15,000 | 70,000
Weighted Average Number of Shares Outstanding, Diluted | [1] |  |  | 13,940,000 | 13,937,000
Net (loss) income attributable to controlling interests per common share-basic (in dollars per share) | $ / shares |  |  |  | $ (2.93) | $ (0.46)
Net (loss) income attributable to controlling interests per common share-diluted (in dollars per share) | $ / shares |  |  |  | $ (2.93) | $ (0.46)
Five Point Eight Seven Five Percent Convertible Senior Notes Due Two Thousand Thirty Five [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Debt Instrument, Convertible, Number of Equity Instruments |  |  |  | 3,600,000 |
Denominator: |  |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities |  | 0 | 0 | 0 | 0
[1] | Shares related to unvested share-based payment awards included in our basic and diluted share counts were 281,282 for the year ended December 31, 2017, compared to 300,478 for the year ended December 31, 2016.
[2] | The effect of dilutive stock compensation arrangements is shown only for informational purposes where we are in a net loss position. In such situations, the effect of including outstanding options and restricted stock would be anti-dilutive, and they are thus excluded from all loss period calculations.

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