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Convertible Subordinated Notes (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 04, 2019 | Dec. 31, 2018 | Dec. 24, 2018 | May 08, 2018 | May 07, 2018 | Mar. 19, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities, Convertible junior subordinated debentures (in shares) | 0 | 117,000 | 0 | 674,000 |  |  |  |  |  |
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes |  |  |  |  |  |  |  |  |  |
Debt issuance costs | $ (847,000) |  | $ (847,000) |  |  | $ (955,000) |  |  |  |
Carrying value of the liability component | 319,418,000 |  | 319,418,000 |  |  | 319,108,000 |  |  |  |
Amortization of Debt Issuance Costs |  |  | 189,000 | $ 320,000 |  |  |  |  |  |
Accumulated Amortization, Debt Issuance Costs | $ 216,000 |  | $ 216,000 |  |  | 109,000 |  |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Discount Rate | 11.40% | 11.40% | 11.40% | 11.40% |  |  |  |  |  |
Debt Instrument, Unamortized Debt Issuance Costs | 3.20% | 3.20% | 3.20% | 3.20% |  |  |  |  |  |
Stated interest rate percentage | 2.75% |  | 2.75% |  |  |  |  |  |  | 2.75%
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes |  |  |  |  |  |  |  |  |  |
Convertible subordinated notes, principal amount |  |  |  |  | $ 25,000 | 6,346,000 | $ 22,418,000.16 | $ 28,800,000 | $ 115,000,000 | $ 143,750,000
Unamortized discount of liability component | $ (443,000) |  | $ (443,000) |  |  | (560,000) |  |  |  |
Debt issuance costs | (43,000) |  | (43,000) |  |  | (54,000) |  |  |  |
Carrying value of the liability component | 5,835,000 |  | 5,835,000 |  |  | 5,732,000 | $ 6,321,000 |  |  |
Carrying value of the equity component | 789,000 |  | 789,000 |  |  | 789,000 |  |  |  |
Convertible subordinated notes, fair value | 6,400,000 |  | 6,400,000 |  |  |  |  |  |  |
Contractual coupon interest expense | 0 | $ 514,000 | 87,000 | $ 1,502,000 |  |  |  |  |  |
Accretion of discount, convertible subordinated notes | 60,000 | 555,000 | 117,000 | 1,715,000 |  |  |  |  |  |
Amortization of Debt Issuance Costs | 5,000 | $ 62,000 | 11,000 | $ 194,000 |  |  |  |  |  |
Accumulated Amortization, Debt Issuance Costs | $ 117,000 |  | $ 117,000 |  |  | $ 106,000 |  |  |  |

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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 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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