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Convertible Senior Notes Accounting for Convertible Senior Notes (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2005 | May 31, 2005
Debt Instrument [Line Items] |  |  |  |
Maturity date | Nov. 30, 2035 |  |  |
Interest expense from accretion of discount on convertible senior notes | $ 548,000 | $ 515,000 |  |
Interest Expense, Other | $ 5,200,000 | $ 5,300,000 |  |
Own-share Lending Arrangement, Shares, Outstanding | 1,459,233 | 1,459,233 | 5,677,950 |
Debt Instrument, Interest Rate, Effective Percentage | 9.20% |  |  |
Conversion price for convertible senior notes (in dollars per share) | $ 24.61 |  |  |
5.875% Convertible Senior Notes Due 2035 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 88,280,000 | $ 88,280,000 | $ 300,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.875% | 5.875%
Conversion price for convertible senior notes (in dollars per share) | $ 24.61 |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: 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=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 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=64930785&loc=d3e28551-108399 + Details
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