LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Long-term debt obligations
Long-term debt	$ 119,159	$ 112,845
Less current portion	36,192	31,513
Long-term debt, less current portion	82,967	81,332
Payments under long-term debt obligations
Due in one year or less	38,019
Due after one year through two years	30,517
Due after two years through three years	54,163
Due after three years through four years	680
Due after four years through five years	229
Due after five years	136
Total payments	123,744
Less amounts representing interest	4,585
Long-term debt	119,159	112,845
Term Loan
Long-term debt obligations
Long-term debt	77,500	83,750
Interest rate (as a percent)	1.40%
Payments under long-term debt obligations
Due in one year or less	16,056
Due after one year through two years	18,669
Due after two years through three years	46,114
Total payments	80,839
Less amounts representing interest	3,339
Long-term debt	77,500	83,750
Notes payable
Long-term debt obligations
Long-term debt	36,851	22,082
Weighted-average interest rate (as a percent)	2.30%
Payments under long-term debt obligations
Due in one year or less	20,036
Due after one year through two years	9,414
Due after two years through three years	7,833
Due after three years through four years	458
Total payments	37,741
Less amounts representing interest	890
Long-term debt	36,851	22,082
Capital lease obligations
Long-term debt obligations
Long-term debt	4,808	7,013
Weighted-average interest rate (as a percent)	5.00%
Payments under long-term debt obligations
Due in one year or less	1,927
Due after one year through two years	2,434
Due after two years through three years	216
Due after three years through four years	222
Due after four years through five years	229
Due after five years	136
Total payments	5,164
Less amounts representing interest	356
Long-term debt	$ 4,808	$ 7,013