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Debt (Loan and Security Agreements) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
May 14, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Nov. 15, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Write off of deferred financing costs |  | $ 100,000 | $ 200,000 | $ 400,000 |
Domestic Line of Credit [Member] | Line of Credit [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.00% |  |  |  |
Domestic Line of Credit [Member] | Line of Credit [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |  |
Domestic Line of Credit [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate (as a percent) | 1.00% |  |  |  |
Domestic Line of Credit [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |  |
Domestic Line of Credit [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 5.00% |  |  |  |
Domestic Line of Credit [Member] | Line of Credit [Member] | Federal Funds Effective Swap Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate (as a percent) | 0.50% |  |  |  |
Domestic Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term line of credit |  | 0 |  |  |
Domestic Line of Credit [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term line of credit |  | 43,800,000 |  |  |
Foreign Line of Credit [Member] | Line of Credit [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.00% |  |  |  |
Foreign Line of Credit [Member] | Line of Credit [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |  |
Foreign Line of Credit [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |  |
Foreign Line of Credit [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as a percent) | 5.00% |  |  |  |
Foreign Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term line of credit |  | 0 |  |  |
Foreign Line of Credit [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term line of credit |  | $ 5,600,000 |  |  |
Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest charges (as a percent) |  | 5.70% |  |  |
Financing costs |  | $ 1,900,000 |  |  |
Credit Agreement [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 90,000,000
Additional borrowing capacity upon satisfaction of loan covenants |  |  |  |  | 20,000,000
Maximum stock repurchase capacity |  | $ 8,300,000 |  |  |
Credit Agreement [Member] | Delayed Draw Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 10,000,000
Periodic payment of principal (as a percent) | 5.00% |  |  |  |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 10,000,000.0 |  |  |  |
Multiplier used to calculate borrowing capacity (as a percent) |  | 1 |  |  |
Credit Agreement [Member] | Domestic Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 500,000.0 |  |  |  |
Credit Agreement [Member] | Domestic Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 9,000,000
Credit Agreement [Member] | Domestic Line of Credit [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 44,400,000
Periodic payment of principal (as a percent) | 5.00% |  |  |  |
Credit Agreement [Member] | Foreign Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 250,000.00 |  |  |  |
Credit Agreement [Member] | Foreign Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 1,000,000
Credit Agreement [Member] | Foreign Line of Credit [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 5,600,000
Credit Agreement [Member] | Unsecured Debt [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 16,700,000 |  |  |
Loan Facility [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Increase in interest rate upon default (as a percent) | 2.00% |  |  |  |
Stock repurchases minimum liquidity requirement | $ 20,000,000.0 |  |  |  |
U.S. Comerica Agreement and the Canadian Comerica Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Write off of deferred financing costs |  |  | $ 100,000 |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + 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 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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