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v2.4.1.9

Net Income per Share Additional Information (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Nov. 27, 2013
Six Percent Tangible Equity Units [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Interest Rate Percentage |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = for_A6TangibleEquityUnitsMember
Convertible Debt [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Interest Rate Percentage | 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Conversion price of Convertible Notes | 24.49 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleDebtMember |
Minimum [Member] | Six Percent Tangible Equity Units [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Debt And Equity Instruments, shares to be Issued | 6,547,800 for_DebtAndEquityInstrumentssharestobeIssued / us-gaap_DebtInstrumentAxis = for_A6TangibleEquityUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] | Six Percent Tangible Equity Units [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Debt And Equity Instruments, shares to be Issued | 7,857,000 for_DebtAndEquityInstrumentssharestobeIssued / us-gaap_DebtInstrumentAxis = for_A6TangibleEquityUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- 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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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