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Debt (Narrative) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Jan. 20, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |  |  |
Term loan balance | $ 75,000,000 |  |  |
Interest expense | 717,000 | $ 30,000 |  |
GE Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, aggregate amount | $ 20,000,000 |  |  |
Credit facility, maturity date | Sep. 26, 2019 |  |  |
Credit facility, aggregate interest rate |  |  |  | 4.75%
Credit facility, outstanding balance |  |  |  | $ 0
Credit facility, remaining availability |  |  |  | 20,000,000
Amended Debt Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, aggregate interest rate | 3.93% |  |  |
On-X Agreement [Member] | Amended Debt Agreement [Member] | Term Loan [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Term loan balance | $ 75,000,000 |  |  |
Credit facility, maturity date | Jan. 20, 2021 |  |  |
Minimum [Member] | GE Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, liquidity requirement after effect to stock repurchase | $ 20,000,000 |  |  |
Credit facility, restriction on cash and cash equivalents |  |  |  | $ 5,000,000
Senior Secured Credit Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 95,000,000 |
Credit facility, default interest rate | 2.00% |  |  |
Senior Secured Credit Facility [Member] | Minimum [Member] | On-X Agreement [Member] | Amended Debt 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] | Amended Debt 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] | Amended Debt 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] | Amended Debt Agreement [Member] | LIBOR [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, margin | 3.75% |  |  |
Revolving Credit Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, aggregate amount | $ 20,000,000 |  |  |
Credit facility, commitment fee percentage | 0.50% |  |  |
Letter Of Credit Sub-Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, aggregate amount | $ 4,000,000 |  |  |
Swing-Line Sub-Facility [Member] | On-X Agreement [Member] | Amended Debt Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit facility, aggregate amount | $ 3,000,000 |  |  |
Swing-Line Sub-Facility [Member] | Minimum [Member] | On-X Agreement [Member] | Amended Debt 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] | Amended Debt 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 of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + 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 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 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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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- Definition The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References No definition available. + Details
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