| **Quarterly Financial Data (unaudited) (Tables)**         | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Quarterly Financial Information Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Quarterly Financial Data                                  |    Quarters Ended   December 31 September 30 June 30 March 312014       Operating revenues$15,676 $23,947 $68,164 $594,086Operating income (loss)$(15,946) $(1,335) $21,038 $509,493Net income (loss) attributable to the Company$(11,101) $(50) $14,609 $402,995Basic and diluted income (loss) per share attributable to the Company$(0.13) $— $0.16 $4.372013       Operating revenues$33,868 $36,827 $33,788 $26,773Operating income (loss)$(1,964) $3,383 $1,583 $(2,225)Net income (loss) attributable to the Company$562 $4,198 $2,704 $(2,474)Basic and diluted income (loss) per share attributable to the Company$— $0.05 $0.03 $(0.03) |

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| - Definition
Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306
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