LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Long-term debt obligations
Long-term debt	$ 124,246	$ 155,985
Less current portion	35,353	43,044
Long-term debt, less current portion	88,893	112,941
Payments under long-term debt obligations
Due in one year or less	37,687
Due after one year through two years	30,633
Due after two years through three years	20,193
Due after three years through four years	41,819
Due after four years through five years	224
Due after five years	308
Total payments	130,864
Less amounts representing interest	6,618
Long-term debt	124,246	155,985
Term Loan
Long-term debt obligations
Long-term debt	86,875	95,000
Interest rate (as a percent)	1.70%
Payments under long-term debt obligations
Due in one year or less	14,568
Due after one year through two years	17,015
Due after two years through three years	18,963
Due after three years through four years	41,602
Total payments	92,148
Less amounts representing interest	5,273
Long-term debt	86,875	95,000
Notes payable
Long-term debt obligations
Long-term debt	26,093	37,756
Weighted-average interest rate (as a percent)	3.00%
Payments under long-term debt obligations
Due in one year or less	16,376
Due after one year through two years	10,343
Due after two years through three years	70
Total payments	26,789
Less amounts representing interest	696
Long-term debt	26,093	37,756
Capital lease obligations
Long-term debt obligations
Long-term debt	11,278	23,229
Weighted-average interest rate (as a percent)	4.50%
Payments under long-term debt obligations
Due in one year or less	6,743
Due after one year through two years	3,275
Due after two years through three years	1,160
Due after three years through four years	217
Due after four years through five years	224
Due after five years	308
Total payments	11,927
Less amounts representing interest	649
Long-term debt	$ 11,278	$ 23,229