LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Long-term debt obligations
Long-term debt	$ 64,937	$ 71,012
Less current portion	30,142	24,262
Long-term debt, less current portion	34,795	46,750
Future minimum payments under long-term debt obligations
Due in one year or less	32,215
Due after one year through two years	23,750
Due after two years through three years	8,396
Due after three years through four years	3,213
Due after four years through five years	214
Due after five years	642
Total minimum payments	68,430
Less amounts representing interest	3,493
Present value of net minimum payments included in long-term debt	64,937	71,012
Capital lease obligations
Long-term debt obligations
Long-term debt	40,488	44,261
Future minimum payments under long-term debt obligations
Due in one year or less	22,265
Due after one year through two years	13,800
Due after two years through three years	2,806
Due after three years through four years	3,213
Due after four years through five years	214
Due after five years	642
Total minimum payments	42,940
Less amounts representing interest	2,452
Present value of net minimum payments included in long-term debt	40,488	44,261
Notes payable
Long-term debt obligations
Long-term debt	24,449	26,751
Future minimum payments under long-term debt obligations
Due in one year or less	9,950
Due after one year through two years	9,950
Due after two years through three years	5,590
Total minimum payments	25,490
Less amounts representing interest	1,041
Present value of net minimum payments included in long-term debt	$ 24,449	$ 26,751