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Long-Term Debt and Credit Facility, Textuals (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2015 | Apr. 01, 2015 | May. 23, 2012 | Oct. 19, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Mar. 29, 2010
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  |  |  |  |  |  |  | $ 6,100,000 | $ 0 |  |
Long-term debt |  |  |  |  | $ 218,900,000 |  |  | 218,900,000 |  | $ 225,000,000 |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  |  | 2,500,000 |
Derivative Asset |  |  |  |  | $ 300,000 |  |  | $ 300,000 |  | $ 85,700,000 |
Payment of quarterly cash dividends |  |  |  |  |  |  |  | $ 1.20 | $ 1.05 |  |
Warrant Transactions |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Common stock sold related to option counterparties net-share-settled warrants |  |  |  |  | 1.7 |  | 3.7 | 1.7 | 3.7 | 3.7 |
Trading days warrants are exercisable | 120 days |  |  |  |  |  |  |  |  |  |
Exercise price per share of Warrants |  |  |  |  | $ 60.32 |  | $ 60.80 | $ 60.32 | $ 60.80 |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  | $ 225,000,000 |  |  |  |  |  |  |  |
Interest rate |  |  | 8.25% |  |  |  |  |  |  |  |
Percentage of principal amount issued |  |  | 100.00% |  |  |  |  |  |  |  |
Interest expense including amortization of deferred financing costs |  |  |  |  | $ 4,800,000 |  | $ 4,800,000 | $ 14,500,000 | $ 14,500,000 |  |
Repayments of Unsecured Debt |  |  |  |  | 6,100,000 |  |  |  |  |  |
Loss on Repurchase of Debt Instrument |  |  |  |  | 600,000 |  |  |  |  |  |
Long-term debt |  |  |  |  | 218,900,000 |  |  | 218,900,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 300,000,000 |  |  | 300,000,000 |  |  |
Available borrowing capacity |  |  |  |  | 246,500,000 |  |  | 246,500,000 |  |  |
Remaining available borrowing capacity |  |  |  |  | $ 239,100,000 |  |  | $ 239,100,000 |  |  |
Interest on Revolving Credit Facility |  |  |  |  | 4.00% |  |  | 4.00% |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Outstanding line of credit |  |  |  |  | $ 0 |  |  | $ 0 |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |
Outstanding line of credit |  |  |  |  | $ 7,400,000 |  |  | $ 7,400,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Payment of quarterly cash dividends |  |  |  |  | $ 0.24 |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  | $ 175,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.50%
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 154.261% |  |  |  |  |
Consecutive trading days threshold for conversion |  |  |  |  |  | 50 days |  |  |  |  |
Short-term Debt, Fair Value |  | $ 273,800,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Final Interest Payment |  | 3,900,000 |  |  |  |  |  |  |  |  |
Principal amount in conversion feature |  | 175,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, If-converted Value in Excess of Principal |  | 94,900,000 |  |  |  |  |  |  |  |  |
Derivative Asset |  | 94,900,000 |  |  |  |  |  |  |  |  |
Net cash outflow in convertible debt settlement |  | $ 178,900,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  |  |  | $ 21,100,000 |  |  |  |  |  |  |
Percentage of principal amount repurchased |  |  |  | 107.50% |  |  |  |  |  |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: 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=34725769&loc=d3e28878-108400 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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