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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.