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Debt (Other Terms of Loan Facility) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Line of Credit [Member] | Federal Funds Rate [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Variable rate, spread over reference rate | 0.50% |
Line of Credit [Member] | Prime Rate [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Variable rate, spread over reference rate | 1.00% |
Line of Credit [Member] | Minimum [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 3.00% |
Line of Credit [Member] | Minimum [Member] | Base Rate [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 3.00% |
Line of Credit [Member] | Minimum [Member] | LIBOR [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 4.00% |
Line of Credit [Member] | Minimum [Member] | LIBOR [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 4.00% |
Line of Credit [Member] | Maximum [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 4.00% |
Line of Credit [Member] | Maximum [Member] | Base Rate [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 4.00% |
Line of Credit [Member] | Maximum [Member] | LIBOR [Member] | U.S. [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 5.00% |
Line of Credit [Member] | Maximum [Member] | LIBOR [Member] | Canadian [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 5.00% |
Loan Facility [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Increase in interest rate upon default | 2.00% |
Covenant, minimum liquidity to buyback stock | $ 20,000,000.0 |
Credit Agreement [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest charges, percentage | 5.80% | 5.70%
Debt issuance costs | $ 2,000,000 |
From November 15, 2016 to November 15, 2017 [Member] | Loan Facility [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Prepayment premium, percent | 2.00% |
From November 15, 2017 to November 15, 2018 [Member] | Loan Facility [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Prepayment premium, percent | 1.00% |
After November 15, 2018 to the Maturity Date [Member] | Loan Facility [Member] | Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Prepayment premium, percent | 0.00% |

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- Definition Debt Instrument, Debt Default, Increase In Interest Rate On Obligations Upon Default + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Stock Repurchases, Minimum Liquidity Requirement + References No definition available. + Details
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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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