| **Redeemable Noncontrolling Interest** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
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| **Noncontrolling Interest [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Redeemable Noncontrolling Interest     | Redeemable Noncontrolling InterestOn April 23, 2010, the Company entered into a transfer agreement with GSSI LLC (“GSSI”), the noncontrolling interest holder in SSV, and acquired all of GSSI’s remaining 30.7% ownership interest in SSV for a negotiated price of $31.0 million in cash. The purchase of GSSI’s interest in SSV was completed on April 23, 2010, resulting in the Company holding 100% interest in SSV. As a result of this agreement, equity-noncontrolling interest and redeemable noncontrolling interest related to SSV was eliminated. The purchase price in excess of the carrying value of the noncontrolling interest of approximately $2.6 million (net of deferred taxes) was recorded as a reduction in additional paid-in capital. Additionally, GSSI held a management agreement with SSV which was terminated concurrent with the Company’s purchase of GSSI’s interest in SSV. |

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| - Definition
The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Details**Name:**us-gaap_NoncontrollingInterestAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |