CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS
Accounts receivable - trade, allowance (in dollars)	$ 2,109	$ 1,388
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	42,646,040	42,484,363
Common stock, shares outstanding	42,646,040	42,484,363