Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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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, after 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.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Indebtedness - Summary of Company's Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 18, 2017	Sep. 17, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total Debt	$ 372,691			$ 497,829
Less: Current Maturities	98,693			146,515
Long-Term Debt	$ 273,998			351,314
Senior Unsecured Notes, 3.95%, Due in Installments through April 2018
Debt Instrument [Line Items]
Debt instrument, stated percentage	3.95%
Senior Unsecured Notes, 4.75%, Due in Installments through April 2021
Debt Instrument [Line Items]
Debt instrument, stated percentage	4.75%
Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt	$ 0			0
Debt issuance costs, net	3,300
Credit Facility \| Revolving Credit Facility \| DAMI Credit Facility
Debt Instrument [Line Items]
Total Debt	0			47,302
Debt issuance costs, net	1,400	$ 1,700
Senior Unsecured Notes \| Senior Unsecured Notes, 3.95%, Due in Installments through April 2018
Debt Instrument [Line Items]
Total Debt	24,986			49,975
Senior Unsecured Notes \| Senior Unsecured Notes, 4.75%, Due in Installments through April 2021
Debt Instrument [Line Items]
Total Debt	239,621			299,562
Unsecured Debt \| Term Loan
Debt Instrument [Line Items]
Total Debt	99,018		$ 84,400	94,626
Capital Lease Obligations with Related Parties
Debt Instrument [Line Items]
Total Debt	1,777			3,095
Capital Lease Obligations with Unrelated Parties
Debt Instrument [Line Items]
Total Debt	$ 7,289			$ 3,269