Parent Company Condensed Balance Sheets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 95,390,000	$ 139,855,000	$ 153,784,000	$ 92,422,000
Property, plant and equipment, net	219,256,000	182,985,000
Other non-current assets	69,725,000	36,727,000
Total Assets	809,956,000	776,306,000	1,808,833,000
LIABILITIES AND EQUITY
Current liabilities	238,119,000	227,169,000
Other long-term liabilities	59,428,000	60,212,000
Stockholders’ equity	297,780,000	281,331,000
Total Liabilities and Stockholders’ Equity	809,956,000	776,306,000
Parent Company
ASSETS
Cash and cash equivalents	94,035,000	120,659,000	130,676,000	29,650,000
Other current assets	946,000	4,299,000
Investment in subsidiaries	242,184,000	203,415,000
Property, plant and equipment, net	1,477,000	1,575,000
Other non-current assets	5,707,000	4,343,000
Total Assets	344,349,000	334,291,000
LIABILITIES AND EQUITY
Current liabilities	12,750,000	6,628,000
Current intercompany accounts payable, net	304,000	12,940,000
Other long-term liabilities	13,065,000	12,942,000
Stockholders’ equity	297,780,000	281,331,000
Total Liabilities and Stockholders’ Equity	344,349,000	334,291,000
Restricted investments	151,200,000
Unrestricted investment	600,000
HBB | Parent Company
ASSETS
Investment in subsidiaries	52,265,000	43,111,000
KC | Parent Company
ASSETS
Investment in subsidiaries	36,772,000	43,656,000
NACoal | Parent Company
ASSETS
Investment in subsidiaries	138,355,000	102,255,000
Other | Parent Company
ASSETS
Investment in subsidiaries	14,792,000	14,393,000
Bellaire | Parent Company
LIABILITIES AND EQUITY
Note payable to Bellaire	$ 20,450,000	$ 20,450,000