CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CONSOLIDATED BALANCE SHEETS
Accounts receivable - trade, allowance (in dollars)	$ 1,578	$ 1,025
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	43,181,137	43,044,185
Common stock, shares outstanding	43,181,137	43,044,185