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Net Income (Loss) Attributable to Controlling Interests Per Common Share Antidilutive Securities (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 shares	Dec. 31, 2017 shares $ / shares	Dec. 31, 2016 shares	Nov. 30, 2005	May 31, 2005
Debt Instrument [Line Items]
Weighted Average Number of Shares, Restricted Stock			281,282	300,478
Conversion price for convertible senior notes | $ / shares	$ 24.61		$ 24.61
5.875% Convertible Senior Notes Due 2035 [Member]
Debt Instrument [Line Items]
Shares potentially issuable and includible in diluted net loss attributable to controlling interest per common share	0	0	0	0
Debt Instrument, Interest Rate, Stated Percentage					5.875%	5.875%
Conversion price for convertible senior notes | $ / shares	$ 24.61		$ 24.61
Debt Instrument, Convertible, Number of Equity Instruments			3,600,000

X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

+ References

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-Publisher FASB
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-SubTopic 10
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

+ References

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-Publisher FASB
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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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