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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 04, 2019 USD ($) | Dec. 24, 2018 USD ($) | May 07, 2018 USD ($) shares | Mar. 19, 2014 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares | May 08, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
Amortization of Debt Issuance Costs |  |  |  |  |  |  | $ 289,000 | $ 420,000 |  |
Interest Expense |  |  |  |  | $ 6,283,000 | $ 6,285,000 | 18,907,000 | 14,763,000 |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock |  |  |  |  |  |  | 27,000 | 75,229,000 |  |
Carrying value of the liability component |  |  |  |  | $ 319,577,000 |  | $ 319,577,000 |  | $ 319,108,000 |
Convertible Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | shares |  |  | 2,822,859 |  |  |  |  |  |  |
Convertible subordinated notes, principal amount | $ 25,000 | $ 22,400,000 | $ 115,000,000 | $ 143,750,000 |  |  |  |  | 6,346,000 | $ 28,800,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 78.00% | 80.00% |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  | 2.75% | 2.75% |  | 2.75% |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  | 44.3169 |  |  | 45.3695 |  |  |
Long-term Debt, Fair Value |  |  |  |  | $ 7,100,000 |  | $ 7,100,000 |  |  |
Interest Expense, Debt |  |  |  |  | 43,000 | 198,000 | 131,000 | 1,700,000 |  |
Amortization of Debt Issuance Costs |  |  |  |  | $ 6,000 | $ 27,000 | $ 19,000 | $ 221,000 |  |
Debt Instrument, Discount Rate |  |  |  |  | 11.40% | 11.40% | 11.40% | 11.40% |  |
Accretion of discount, convertible subordinated notes |  |  |  |  | $ 61,000 | $ 246,000 | $ 178,000 | $ 1,961,000 |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  |  | $ 22.56 | $ 22.04 |  | $ 22.04 |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle | $ 27,163 | $ 22,900,000 | $ 74,800,000 |  |  |  |  |  |  |
Interest Expense |  | 200,000 | 400,000 |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock |  | 23,000,000 | $ 75,200,000 |  |  |  |  |  |  |
Carrying value of the liability component |  | $ 6,319,000 |  |  | $ 5,902,000 |  | $ 5,902,000 |  | $ 5,732,000 |
Debt Instrument, Unamortized Debt Issuance Costs |  |  |  |  | 3.20% | 3.20% | 3.20% | 3.20% |  |

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- Definition Amount of accretion of discount for the standardized measure of discounted future net cash flow related to proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 + 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 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 Percentage of principal amount of debt redeemed. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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- Definition The cash outflow to reacquire callable preferred stock which is identified as being convertible to another type of financial security. + 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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