SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in valuation and qualifying accounts
Balance at Beginning of Year	$ 32,654	$ 30,821	$ 15,766
Charged to Costs and Expenses	14,838	15,382	22,510
Deductions	16,151	13,549	7,455
Balance at End of Year	31,341	32,654	30,821
Valuation allowance on foreign tax credit carryforwards
Movement in valuation and qualifying accounts
Balance at Beginning of Year	16,755	16,983	11,734
Charged to Costs and Expenses			5,249
Deductions	1,359	228
Balance at End of Year	15,396	16,755	16,983
Valuation allowance on foreign net operating losses
Movement in valuation and qualifying accounts
Balance at Beginning of Year	560
Charged to Costs and Expenses	338	560
Balance at End of Year	898	560
Valuation allowance on state net operating losses
Movement in valuation and qualifying accounts
Charged to Costs and Expenses	494
Balance at End of Year	494
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Balance at Beginning of Year	15,339	13,838	4,032
Charged to Costs and Expenses	14,006	14,822	17,261
Deductions	14,792	13,321	7,455
Balance at End of Year	$ 14,553	$ 15,339	$ 13,838