Long-Term Debt (Table) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term Debt	$ 1,399,151	$ 1,330,563
Long-term Debt, Current Maturities	48,253	11,352
Long-term Debt, Excluding Current Maturities	1,350,898	1,319,211
Acquisition Notes [Member] \| Non Interest Bearing Acquisition Note [Member]
Debt Instrument [Line Items]
Long-term Debt	4,847	4,623
Notes Payable to Banks [Member] \| Senior Indenture June 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	393,000	393,000
Notes Payable to Banks [Member] \| Senior Debentures April 2028 [Member]
Debt Instrument [Line Items]
Long-term Debt	59,645	59,645
Notes Payable to Banks [Member] \| Term Loan Due April 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	839,375
Line of Credit [Member] \| Revolving Line of Credit April 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	100,000
Line of Credit [Member] \| Revolving Line of Credit March 2019 [Domain]
Debt Instrument [Line Items]
Long-term Debt	0	85,000
Bank Loans [Member] \| Term Loan due March 2019 [Member] [Domain]
Debt Instrument [Line Items]
Long-term Debt	0	786,250
Notes Payable, Other Payables [Member] \| Various Interest Rate Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,284	$ 2,045

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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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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