Long-Term Debt (Details) (USD $)	3 Months Ended		6 Months Ended				12 Months Ended				6 Months Ended		6 Months Ended	1 Months Ended																					6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2011 STARS [Member]	May 21, 2011 Senior Note June 2021 [Member]	Jun. 30, 2014 Multi Currency Sub Facility [Member]	Jun. 30, 2014 Letter Of Credit Sub Facility [Member]	Jun. 30, 2014 Contingent Credit Agreement Term Loan Facility [Member]	Jun. 30, 2014 Contingent Credit Agreement Revolving Facility [Domain]	Jun. 30, 2014 Term Loan due March 2019 [Member] [Domain]	Mar. 31, 2016 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member]	Mar. 31, 2014 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member]	Jun. 30, 2014 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member]	Dec. 31, 2013 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member]	Dec. 31, 2011 Acquisition Notes [Member] Non Interest Bearing Acquisition Note [Member] STARS [Member]	Jun. 30, 2014 Notes Payable to Banks [Member] Senior Note June 2021 [Member]	Dec. 31, 2013 Notes Payable to Banks [Member] Senior Note June 2021 [Member]	Jun. 30, 2014 Notes Payable to Banks [Member] Senior Debentures August 2014 [Member]	Dec. 31, 2013 Notes Payable to Banks [Member] Senior Debentures August 2014 [Member]	Jun. 30, 2014 Notes Payable to Banks [Member] Senior Debentures April 2028 [Member]	Dec. 31, 2013 Notes Payable to Banks [Member] Senior Debentures April 2028 [Member]	Jun. 30, 2014 Line of Credit [Member] Revolving Line of Credit March 2019 [Domain]	Dec. 31, 2013 Line of Credit [Member] Revolving Line of Credit March 2019 [Domain]	Jun. 30, 2014 Line of Credit [Member] Revolving Line of Credit March 2016 [Member]	Dec. 31, 2013 Line of Credit [Member] Revolving Line of Credit March 2016 [Member]	Jun. 30, 2014 Bank Loans [Member] Term Loan due March 2019 [Member] [Domain]	Dec. 31, 2013 Bank Loans [Member] Term Loan due March 2019 [Member] [Domain]	Jun. 30, 2014 Bank Loans [Member] Term Loan due March 2016 [Member]	Dec. 31, 2013 Bank Loans [Member] Term Loan due March 2016 [Member]	Jun. 30, 2014 Notes Payable, Other Payables [Member] Various Interest Rate Loans [Member]	Dec. 31, 2013 Notes Payable, Other Payables [Member] Various Interest Rate Loans [Member]	Jun. 30, 2014 Other Current Assets [Member]
Long-Term Debt
Total long-term Debt	$ 1,473,601,000		$ 1,473,601,000			$ 839,930,000										$ 4,480,000	$ 9,276,000		$ 393,000,000	$ 393,000,000	$ 825,000	$ 825,000	$ 59,645,000	$ 59,645,000	$ 185,000,000	$ 0	$ 0	$ 100,000,000	$ 828,750,000	$ 0	$ 0	$ 275,625,000	$ 1,901,000	$ 1,559,000
Less current portion of long-term debt	33,339,000		33,339,000			28,154,000
Long-term debt, net of current portion	1,440,262,000		1,440,262,000			811,776,000
Interest Rate Swap realized Gain Loss	4,100,000
Debt instrument, amount of installment														5,000,000	5,000,000
Debt instrument, stated interest rate percentage								7.25%											7.25%		5.70%		7.55%		2.73%		1.90%		2.10%			2.90%
Debt instrument, face amount								400,000,000										15,000,000
Term facility, maximum borrowing capacity									100,000,000	50,000,000	850,000,000	550,000,000
Potential Increase to Term Loan and Line of Credit	500,000,000		500,000,000
Repayments of Debt											10,600,000
Accrued interest expense	5,200,000		5,200,000			4,600,000
Debt Issuance Cost			14,000,000
Interest Expense, Debt	17,321,000	12,438,000	34,149,000	24,814,000									500,000
Payments of Debt Issuance Costs			14,042,000	0																															13,500,000
Deferred Costs, Current					5,400,000
Write off of Deferred Debt Issuance Cost			800,000
Payments to acquire interest in joint venture							$ 20,000,000