Short-Term and Long-Term Debt, Including Capital Leases Credit Facility (Narrative) (Details)
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12 Months Ended |
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Nov. 05, 2015
USD ($)
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Dec. 31, 2015
USD ($)
Integer
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Feb. 01, 2015
USD ($)
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| Debt Instrument [Line Items] |
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| Debt instrument, interest period |
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1 month
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| Letters of credit outstanding amount |
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$ 17,211,000
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$ 17,511,000
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| Line of credit facility, remaining borrowing capacity |
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$ 142,413,000
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149,134,000
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| Number of quarters | Integer |
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4
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| Less: portion of Credit Facility classified as short-term |
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$ (19,958,000)
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(2,002,000)
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| Interest expense, debt |
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8,983,000
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6,812,000
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$ 7,191,000
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| Interest paid |
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$ 7,973,000
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5,880,000
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$ 6,379,000
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| Capital stock of Company's and Guarantor's present and future domestic subsidiaries |
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| Debt Instrument [Line Items] |
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| Line of credit facility, guarantee obligation, percentage of stock (percent) |
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100.00%
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| Voting stock of present and future first-tier foreign subsidiaries of the Company or Guarantor |
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| Debt Instrument [Line Items] |
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| Line of credit facility, guarantee obligation, percentage of stock (percent) |
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65.00%
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| Non-voting stock of present and future first-tier foreign subsidiaries of the Company or Guarantor |
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| Debt Instrument [Line Items] |
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| Line of credit facility, guarantee obligation, percentage of stock (percent) |
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100.00%
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| Capital stock of Foreign Borrowers |
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| Debt Instrument [Line Items] |
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| Line of credit facility, guarantee obligation, percentage of stock (percent) |
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100.00%
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| Minimum |
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| Debt Instrument [Line Items] |
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| Lessee leasing arrangements, capital leases, term of contract |
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24 months
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| Maximum |
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| Debt Instrument [Line Items] |
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| Lessee leasing arrangements, capital leases, term of contract |
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60 months
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| UK Borrower | GAB Robins |
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| Debt Instrument [Line Items] |
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| Other long-term debt, noncurrent |
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$ 78,355,000
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| Credit Facility |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, current borrowing capacity |
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$ 400,000,000
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| Credit Facility |
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$ 243,667,000
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$ 155,002,000
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| Credit Facility | London Interbank Offered Rate (LIBOR) |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate (percent) |
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1.00%
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| Credit Facility | Base Rate Loans | Federal Funds Rate |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate (percent) |
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0.50%
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| Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate (percent) |
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1.50%
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| Credit Facility | Minimum | Base Rate |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate (percent) |
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0.50%
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| Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate (percent) |
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2.25%
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| Credit Facility | Maximum | Base Rate |
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| Debt Instrument [Line Items] |
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| Debt instrument, basis spread on variable rate (percent) |
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1.25%
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| Credit Facility | UK Borrower |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, current borrowing capacity |
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$ 185,000,000
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| Credit Facility | Canadian Borrower |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, current borrowing capacity |
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40,000,000
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| Credit Facility | Australian Borrower |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, current borrowing capacity |
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15,000,000
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| Letter of credit subfacility |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, current borrowing capacity |
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$ 100,000,000
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| Wells Fargo Bank, National Association | Credit Facility | 2015 Amendment to Credit Agreement |
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| Debt Instrument [Line Items] |
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| Debt instrument, covenant, maximum allowable exclusions from EBITDA in remainder of fiscal year |
$ 27,000,000
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| Debt instrument, covenant, maximum allowable exclusions from EBITDA in year two |
13,000,000
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| Debt instrument, covenant, maximum aggregate allowable exclusions from EBITDA |
38,000,000
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| Debt instrument, covenant, allowable disposition of immaterial foreign subsidiaries, maximum book value |
$ 15,000,000
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| Debt instrument, covenant, coverage ratio |
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1.25
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| Debt instrument, covenant, leverage ratio in period one |
3.75
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| Debt instrument, covenant, leverage ratio in period two |
3.50
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| Debt instrument, covenant, leverage ratio in period three |
3.25
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