Debt (Schedule of Long-term Debt and Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Nov. 30, 2010
Debt Instrument
Long-term debt, gross	$ 417,058	$ 440,821
Less current portion	120,078	5,000
Total excluding current portion	296,980	435,821
Debt Issuance Costs	$ 900	$ 1,600
Long-term debt, weighted average interest rate	2.48%	2.08%
2017	$ 121,875
2018	7,500
2019	9,375
2020	280,105
2021	0
Revolving Credit Facility
Debt Instrument
Long-term debt, gross	212,605	$ 233,513
Term Loan
Debt Instrument
Long-term debt, gross	91,250	96,250
Convertible Notes
Debt Instrument
Long-term debt, gross	113,203	111,058
Convertible note principal amount	115,000	115,000	$ 115,000
Convertible notes carrying value	113,200
Capital Lease Obligations
Debt Instrument
Other long-term liabilities	$ 2,600	$ 1,100

Long-term Debt, Current Maturities before debt issuance costs

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Long-term debt, gross, excluding current maturities

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of long-term debt outstanding.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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