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Debt and Capital Lease Obligations | 12 Months Ended
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Dec. 31, 2017
Debt and Capital Lease Obligations [Abstract] |
Debt and Capital Leases Disclosures [Text Block] | Debt and Capital Lease Obligations Credit Facilities On September 29, 2017, the Company entered into a five-year senior unsecured revolving credit facility (the “Facility”) with a maximum aggregate principal amount of $150,000, with a sublimit of $30,000 for letters of credit and a sublimit of $30,000 for swing line loans. The Facility may be increased by up to $100,000 to a maximum aggregate principal amount of $250,000 pursuant to the terms of the credit agreement, subject to the lenders’ agreement to increase their commitments or the addition of new lenders extending such commitments. Such increases to the Facility may be in the form of additional revolving credit loans, term loans or a combination thereof, and are contingent upon there being no events of default under the Facility and satisfaction of other conditions precedent and are subject to the other limitations set forth in the credit agreement. The Facility is scheduled to mature in September 2022. The proceeds were used to refinance existing indebtedness of the Company and may also be used for working capital, capital expenditures and other general corporate purposes. The Facility refinanced the Company’s obligations for its unsecured credit facility under the credit agreement dated as of February 4, 2015, as amended, which was terminated as of the date of the new Facility. Unless the Company elects otherwise under the credit agreement, interest on borrowings under the Facility is based on the highest of (a) the federal funds rate (not less than 0%) plus 0.5%, (b) the administrative agent's prime rate and (c) the LIBOR Rate plus 1.0%, in each case plus a margin that can range from 0.3% to 0.8% with respect to the Facility depending on the Company’s ratio of consolidated funded indebtedness to earnings before interest, taxes, depreciation and amortization, as set forth in the credit agreement. Payments of interest for each loan that is based on the LIBOR Rate are due in arrears on the last day of the interest period applicable to such loan (with interest periods of one, two or three months being available, at the Company’s option). Payments of interest on loans that are not based on the LIBOR Rate are due on the last day of each quarter ended March 31, June 30, September 30 and December 31 of each year. All unpaid amounts of principal and interest are due at maturity. As of December 31, 2017, the Company had $40,500 in borrowings outstanding under the revolving credit facility, $7,932 utilized for outstanding letters of credit and $101,568 of available borrowing capacity under the revolving credit facility. The interest rate on the outstanding borrowings under the facility was 2.9% at December 31, 2017. The Facility contains customary events of default including, among other things, payment defaults, breach of covenants, cross acceleration to material indebtedness, bankruptcy-related defaults, material judgment defaults, and the occurrence of certain change of control events. The occurrence of an event of default may result in, among other things, the termination of the Facilities, acceleration of repayment obligations and the exercise of remedies by the lenders with respect to the Company and its subsidiaries that are party to the Facility. The Facility also contains financial covenants and other covenants that, among other things, restrict the ability of the Company and its subsidiaries, without the approval of the required lenders, to engage in certain mergers, consolidations, asset sales, dividends and stock repurchases, investments, and other transactions or to incur liens or indebtedness in excess of agreed thresholds, as set forth in the credit agreement. The Facility replaced the Company's previously existing unsecured credit facility, which had a maximum aggregate principal amount of $275,000, including a revolving credit facility of $150,000 and a term loan facility of $125,000. The previous revolving credit facility was scheduled to expire in February 2020. Capital Leases Primarily through acquisitions, the Company assumed several equipment leases that met the criteria for classification as a capital lease. The leased equipment is being amortized over the shorter of the lease term or useful life. Property and equipment include the following amounts for assets under capital leases:
|  | December 31, 2017 |  | December 31, 2016
Equipment |  | $ | 635 |  |  | $ | 635 |
Accumulated amortization |  | (413 | ) |  | (307 | )
|  | $ | 222 |  |  | $ | 328 |
Amortization of assets under capital leases is included in depreciation and amortization expense. Future minimum payments, by year and in the aggregate, under non-cancelable capital leases with initial or remaining terms of one year or more consist of the following at December 31, 2017:
2018 |  | $ | 391 |
2019 |  | 325 |
2020 |  | 60 |
2021 |  | — |
2022 |  | — |
Thereafter |  | — |
Total |  | 776 |
Less amounts representing interest |  | 52 |
Present value of net minimum lease payments (including current portion of $359) |  | $ | 724 |
Interest Payments Interest payments during 2017, 2016 and 2015 were $1,193, $1,770 and $2,017, respectively. No interest was capitalized during the years ended December 31, 2017, 2016 and 2015.

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- Definition The entire disclosure for debt and capital lease obligations can be reported. Information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. Also includes descriptions and amounts of capital leasing arrangements that consist of direct financing, sales type and leveraged leases. Disclosure may include the effect on the balance sheet and the income statement resulting from a change in lease classification for leases that at inception would have been classified differently had guidance been in effect at the inception of the original lease. + References No definition available. + Details
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