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Derivatives and Hedging Activities (Details) (USD $) |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2012 Interest Rate Swap [Member] | Dec. 31, 2012 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Accounts Payable And Other Liabilities [Member] | Dec. 31, 2011 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Accounts Payable And Other Liabilities [Member] | Dec. 31, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] derivative_instrument | Dec. 31, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Interest Expense [Member] | Dec. 31, 2011 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Interest Expense [Member] | Dec. 31, 2008 Not Designated as Hedging Instrument [Member] Forward Contracts [Member] | Oct. 31, 2011 Not Designated as Hedging Instrument [Member] Forward Contracts [Member] | Dec. 31, 2012 Not Designated as Hedging Instrument [Member] Forward Contracts [Member] Change in value of forward equity commitment [Member] | Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Forward Contracts [Member] Change in value of forward equity commitment [Member] | Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Forward Contracts [Member] Other Assets [Member] | Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Forward Contracts [Member] Other Assets [Member] | Dec. 31, 2012 Secured Term Loan [Member] | Dec. 31, 2012 Secured Term Loan 2 [Member] | Dec. 31, 2012 Secured Term Loan 1 [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instrument, Settlement Amount |  | $ 3,539,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 255,000,000 | 35,551,000 | 25,000,000
Expected amount of derivative related interest to be reclassified to interest expense over the next 12 months | 2,759,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivatives |  |  |  |  | 255,000,000 |  |  |  |  |  |  |  |  |  |  |
Forward purchase equity commitment, shares |  |  |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |
Share repurchases, final price paid per share |  |  |  |  |  |  |  | $ 5.60 |  |  |  |  |  |  |  |
Forward contract indexed to issuers equity share settlement cash settlement value |  |  |  |  |  |  |  |  | 4,024,000 |  |  |  |  |  |  |
Forward contract indexed to issuers equity share settlement shares retired |  |  |  |  |  |  |  |  | 3,974,645 |  |  |  |  |  |  |
Derivative liabilities |  |  | (6,556,000) | (3,236,000) |  |  |  |  |  |  |  |  |  |  |  |
Amount of Loss Recognized in OCI on Derivative (Effective Portion) |  |  |  |  |  | (8,886,000) | (835,000) |  |  |  |  |  |  |  |  |
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) |  | 1,837,000 |  |  |  | 724,000 | 2,879,000 |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative |  |  |  |  |  |  |  |  |  | $ 0 | $ 2,030,000 | $ 2,030,000 | $ 8,906,000 |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 4 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624177-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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. + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -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. + Details
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- Definition The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-19 -Paragraph 50 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
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- Definition The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-19 -Paragraph 50 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 + Details
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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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