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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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 of unamortized debt discount (premium) and debt issuance costs.

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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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long-Term Debt - Components Table (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Jul. 28, 2014	Nov. 19, 2013
Long-Term Debt
Total long-term debt, excluding current portion	$ 502,539	$ 568,331
Revolving Credit Facility
Long-Term Debt
Total	14,100	90,835
Senior Notes 5.125 Percent Due 2022 [Member]
Long-Term Debt
Total	$ 247,371	246,742
Interest rate, as a percentage	5.125%
Face value	$ 250,000		$ 250,000
Capitalized debt issuance costs	2,600	3,300
Convertible Senior Notes 1.00 percent due 2020 [Member]
Long-Term Debt
Total	$ 241,068	230,754
Effective interest rate percentage				5.26%
Interest rate, as a percentage	1.00%
Face value	$ 287,500
Unamortized discount and capitalized debt issuance costs	$ 46,432	$ 56,746