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

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Long-Term Debt (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	May. 21, 2011	Apr. 30, 1998
Debt Instrument [Line Items]
Long-term debt	$ 1,364,008	$ 1,330,563
Less current portion of long-term debt	48,497	11,352
Long-term debt, net of current portion	1,315,511	1,319,211
7.25% senior notes due June 2021 [Member]
Debt Instrument [Line Items]
Stated rate on debt			7.25%
Acquisition Notes [Member] \| Non-interest bearing acquisition note, $5.0 million installment due March 2016
Debt Instrument [Line Items]
Long-term debt	4,924	4,623
Notes Payable to Banks [Member] \| 7.25% senior notes due June 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 393,000	393,000
Stated rate on debt	7.25%
Notes Payable to Banks [Member] \| 7.55% senior debentures due April 2028 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 59,645	59,645
Stated rate on debt	7.55%			7.55%
Line of Credit [Member] \| Revolving line of credit borrowings due April 2020, weighted-average interest rate of 1.96% at December 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 75,000	0
Stated rate on debt	1.96%
Line of Credit [Member] \| Revolving line of credit borrowings due March 2019, weighted-average interest rate of 3.92% at December 31, 2014, extinguished April 2015
Debt Instrument [Line Items]
Long-term debt	$ 0	85,000
Stated rate on debt	3.92%
Bank Loans [Member] \| Term loan facility borrowings due April 2020, weighted-average interest rate of 1.96% at December 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 828,750	0
Stated rate on debt	1.96%
Bank Loans [Member] \| Term loan facility borrowings due March 2019, weighted-average interest rate of 2.41% at December 31, 2014, extinguished April 2015
Debt Instrument [Line Items]
Long-term debt	$ 0	786,250
Stated rate on debt	2.41%
Notes Payable, Other Payables [Member] \| Various interest rates with maturities through 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,689	$ 2,045