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Consolidated Statements of Stockholders' Equity (Parentheticals) - AOCI Attributable to Parent [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Unrealized gain (loss) on interest rate swaps, tax $ (609) $ (860) $ 462
Amortization of unrealized loss on interest rate swaps, tax     109
Pension liability adjustment, tax $ 1,176 $ (5,658) $ 5,060