SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in valuation and qualifying accounts
Balance at Beginning of Year	$ 25,106	$ 25,317	$ 24,692
Charged to Costs and Expenses	1,304	2,978	2,806
Deductions	9,303	3,189	2,181
Balance at End of Year	17,107	25,106	25,317
Valuation allowance on foreign tax credit carryforwards
Movement in valuation and qualifying accounts
Balance at Beginning of Year	10,577	13,576	15,396
Deductions	6,397	2,999	1,820
Balance at End of Year	4,180	10,577	13,576
Valuation allowance on foreign net operating losses
Movement in valuation and qualifying accounts
Balance at Beginning of Year	1,500	1,610	898
Charged to Costs and Expenses	172		712
Deductions		110
Balance at End of Year	1,672	1,500	1,610
Valuation allowance on state net operating losses
Movement in valuation and qualifying accounts
Balance at Beginning of Year	1,687	1,126	494
Charged to Costs and Expenses	275	561	632
Balance at End of Year	1,962	1,687	1,126
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Balance at Beginning of Year	11,342	9,005	7,904
Charged to Costs and Expenses	857	2,417	1,462
Deductions	2,906	80	361
Balance at End of Year	$ 9,293	$ 11,342	$ 9,005