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Convertible Subordinated Notes (Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares | Mar. 19, 2014 component $ / shares | Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 $ / shares | Jun. 30, 2016 $ / shares | Mar. 31, 2016 $ / shares | Sep. 30, 2014 | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ / shares |  |  | $ 0.050 | $ 0.050 | $ 0.025 | $ 0.025 |  | $ 0.075 | $ 0.05 |
Debt instrument maturity date |  |  |  |  |  |  | Mar. 15, 2021 |  |  |
Deferred tax liability | $ 225,000 |  | $ 615,000 |  |  |  |  | $ 225,000 | $ 615,000 |
Amortization of debt issuance costs |  |  |  |  |  |  |  | 820,000 | 824,000 | $ 921,000
Deferred Tax Liabilities, Convertible Subordinated Notes | 4,096,000 |  | $ 8,636,000 |  |  |  |  | 4,096,000 | 8,636,000 |
Convertible subordinated notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount | $ 143,750,000.00 |  |  |  |  |  |  | $ 143,750,000.00 |  |
Debt instrument interest rate (in percent) |  | 2.75% |  |  |  |  |  |  |  |
Debt conversion (in dollars per share) | $ / shares | $ 22.41 | $ 22.56 |  |  |  |  |  | $ 22.41 |  |
Debt redemption price (percent) |  | 100.00% |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  | 7 years |  |
Number of recognition components, convertible debt | component |  | 2 |  |  |  |  |  |  |  |
Deferred tax liability | $ 12,700,000 |  |  |  |  |  |  | $ 12,700,000 |  |
Conversion ratio | 44.6266 | 44.3169 |  |  |  |  |  | 0.0444108 |  |
Long-term debt, fair value | $ 180,300,000 |  |  |  |  |  |  | $ 180,300,000 |  |
Interest expense |  |  |  |  |  |  |  | 4,000,000 |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  | 500,000 |  |
Accretion of discount |  |  |  |  |  |  |  | $ 4,300,000 | $ 3,900,000 |
Remaining discount amortization period |  |  |  |  |  |  |  | 38 months |  |
Effective interest rate (percent) | 2.75% |  | 6.75% |  |  |  |  | 2.75% | 6.75% |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 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 Reference 4: 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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