Long-Term Debt (Table) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Apr. 30, 1998
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,348,430	$ 1,364,008
Unamortized Debt Issuance Expense	(25,849)	(27,334)
Long-term Debt	1,322,581	1,336,674
Long-term Debt, Current Maturities	(43,640)	(48,497)
Unamortized Debt Issuance Expense, Current Maturities	0	0
Long-term Debt, Excluding Current Maturities Gross	1,304,790	1,315,511
Unamortized Debt Issuance Expense, Net	(25,849)	(27,334)
Long-term Debt, Excluding Current Maturities	$ 1,278,941	1,288,177
7.25% senior notes due June 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%
Acquisition Notes [Member] \| Non-interest bearing acquisition note, $5.0 million installment due March 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0	4,924
Unamortized Debt Issuance Expense	0	0
Long-term Debt	$ 0	4,924
Notes Payable to Banks [Member] \| 7.25% senior notes due June 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%
Long-term Debt, Gross	$ 393,000	393,000
Unamortized Debt Issuance Expense	(10,655)	(11,121)
Long-term Debt	$ 382,345	381,879
Notes Payable to Banks [Member] \| 7.55% senior debentures due April 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.55%		7.55%
Long-term Debt, Gross	$ 59,645	59,645
Unamortized Debt Issuance Expense	(227)	(231)
Long-term Debt	$ 59,418	$ 59,414
Notes Payable to Banks [Member] \| Term loan facility borrowings due April 2020, weighted-average interest rate of 2.18% and 1.96% as of March 31, 2016 and December 31, 2015, respectively
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.18%	1.96%
Bank Loans [Member] \| Term loan facility borrowings due April 2020, weighted-average interest rate of 2.18% and 1.96% as of March 31, 2016 and December 31, 2015, respectively
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 818,125	$ 828,750
Unamortized Debt Issuance Expense	(9,073)	(9,720)
Long-term Debt	$ 809,052	$ 819,030
Line of Credit [Member] \| Revolving line of credit borrowings due April 2020, weighted-average interest rate of 2.18% and 1.96% as of March 31, 2016 and December 31, 2015, respectively
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.18%	1.96%
Long-term Debt, Gross	$ 75,000	$ 75,000
Unamortized Debt Issuance Expense	(5,894)	(6,262)
Long-term Debt	69,106	68,738
Notes Payable, Other Payables [Member] \| Various debt instruments with maturities through 2019
Debt Instrument [Line Items]
Long-term Debt, Gross	2,660	2,689
Unamortized Debt Issuance Expense	0	0
Long-term Debt	$ 2,660	$ 2,689

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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