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Earnings per Share Earnings per share narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2013 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Oct. 16, 2017 | Apr. 10, 2013 | Mar. 01, 2013 | Sep. 11, 2012 | Mar. 15, 2007
Debt Conversion [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized | 2,000,000 |  |  |  | 2,000,000 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 9.75% |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  | 4,000
Depositary shares issued |  |  |  |  |  |  |  |  |  |  |  | 4,000,000
Preferred shares redeemed |  |  |  |  |  |  |  | 2,000 | 2,000 |  |  |
Depositary shares redeemed |  |  |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |
Payments for Repurchase of Redeemable Preferred Stock |  |  |  | $ 50,400 |  |  | $ 50,420 |  |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  | $ 609.375 |  |  | $ 609.375 |  |  |  |  |  |
Preferred Dividends | $ 0 |  | $ (1,218) |  | $ 0 | $ (3,656) |  |  |  |  |  |
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Subordinated Debt |  |  |  |  |  |  |  |  |  |  | $ 57,500 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 3.25% |
Stock Issued During Period, Shares, Other |  |  | 2,400,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  |  |  |  | $ 23.80 |
2018 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Subordinated Debt |  |  |  |  |  |  |  |  |  | $ 86,250 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 3.00% |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  |  |  | $ 32.31 |  |
Debt Conversion, Converted Instrument, Amount |  | $ 20,309 |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued |  | 629,000 |  |  |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  | $ 65,941 |  |  |  |  |  |  |  |  |  |

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- Definition Depositary shares redeemed + References No definition available. + Details
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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition The cash outflow for reacquisition of callable preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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