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Debt (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Line of Credit Facility [Line Items] |  |  |  |  |
Term loan balance | $ 69,678 |  | $ 69,678 |  | $ 73,594
Interest expense | 851 | $ 742 | 2,500 | $ 2,300 |
Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility outstanding balance | 0 |  | 0 |  | 0
Credit facility remaining availability | 20,000 |  | $ 20,000 |  | $ 20,000
Revolving Credit Facility [Member] | On-X Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility commitment fee percentage |  |  | 0.50% |  |
Revolving Credit Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility aggregate commitments | 20,000 |  | $ 20,000 |  |
Senior Secured Credit Facility [Member] | On-X Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility aggregate commitments | $ 95,000 |  | $ 95,000 |  |
Credit facility aggregate interest rate | 3.99% |  | 3.99% |  |
Credit facility default interest rate | 2.00% |  | 2.00% |  |
Senior Secured Credit Facility [Member] | Minimum [Member] | On-X Agreement [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility margin |  |  | 1.75% |  |
Senior Secured Credit Facility [Member] | Minimum [Member] | On-X Agreement [Member] | LIBOR [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility margin |  |  | 2.75% |  |
Senior Secured Credit Facility [Member] | Maximum [Member] | On-X Agreement [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility margin |  |  | 2.75% |  |
Senior Secured Credit Facility [Member] | Maximum [Member] | On-X Agreement [Member] | LIBOR [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility margin |  |  | 3.75% |  |
Term Loan [Member] | On-X Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Term loan balance | $ 75,000 |  | $ 75,000 |  |
Credit facility maturity date |  |  | Jan. 20, 2021 |  |
Letter Of Credit Sub-Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility aggregate commitments | 4,000 |  | $ 4,000 |  |
Swing-Line Sub-Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility aggregate commitments | $ 3,000 |  | $ 3,000 |  |
Swing-Line Sub-Facility [Member] | Minimum [Member] | On-X Agreement [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility margin |  |  | 1.75% |  |
Swing-Line Sub-Facility [Member] | Maximum [Member] | On-X Agreement [Member] | Base Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit facility margin |  |  | 2.75% |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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