SHAREHOLDERS' EQUITY (Details) (USD $)	0 Months Ended	12 Months Ended			1 Months Ended
	Nov. 14, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011 Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount	$ 50,000,000
Stock repurchase program, authorized period	12 months
Shares repurchased during the period		195,599	205,902
Treasury Stock, Value, Acquired, Cost Method		5,500,000	5,200,000
Issuance of common stock through a public offering, net of expenses (in shares)					5,750,000
Sale price of common stock (in dollars per share)					$ 46.00
Proceeds from issuance of common stock through a public offering					249,600,000
Issuance of common stock through a public offering, expenses				$ 14,871,000	$ 14,900,000