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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 12, 2021 | Dec. 31, 2020 | Sep. 09, 2020 | Mar. 19, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 |  |  | $ 0.01 |  |
Credit Facility amortization of debt issuance costs | $ 193,000 | $ 200,000 |  |  |  |
Interest Expense | 7,584,000 | 8,428,000 |  |  |  |
Conversions and maturity of the convertible subordinated notes due 2021 | 3,980,000 | 0 |  |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock, Cash Payment | 3,800,000 |  |  |  |  |
Convertible Preferred Stock, Nonredeemable or Redeemable, Issuer Option, Value |  |  |  |  | $ 2,400,000 |
Additional Paid-in Capital |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other | 1,400,000 |  |  |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible subordinated notes, principal amount |  |  |  | $ 2,559,000 |  |
Stated interest rate percentage |  |  |  |  |  | 2.75%
Acquisition debt imputed interest expense | 18,000 | 43,000 |  |  |  |
Credit Facility amortization of debt issuance costs | 1,000 | $ 6,000 |  |  |  |
Debt Instrument, Discount Rate |  | 11.40% |  |  |  |
Accretion of discount, convertible subordinated notes | 20,000 | $ 65,000 |  |  |  |
Carrying value of the liability component | $ 0 |  | $ 200,000 | $ 2,538,000 | $ 0 |
Debt Instrument, Unamortized Debt Issuance Costs | 3.10% | 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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + Details
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