GENERAL INFORMATION (Details) (USD $)	1 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended				12 Months Ended		1 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended
	Nov. 18, 2013	Sep. 25, 2013	May 28, 2013	Mar. 15, 2010	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2013 Mr. Wobensmith [Member]	Mar. 15, 2010 Genco [Member]	Dec. 31, 2013 Genco [Member]	Dec. 31, 2012 Genco [Member]	Dec. 31, 2013 Genco [Member] 5% Convertible Notes, due August 15, 2015 [Member]	Dec. 31, 2013 Genco [Member] Minimum [Member]	Dec. 31, 2013 Class B Stock Par Value [Member]	Dec. 31, 2012 Class B Stock Par Value [Member]	Nov. 18, 2013 Class B Stock Par Value [Member] Genco [Member]	Sep. 25, 2013 Class B Stock Par Value [Member] Genco [Member]	May 28, 2013 Class B Stock Par Value [Member] Genco [Member]	Mar. 15, 2010 Class B Stock Par Value [Member] Genco [Member]	Dec. 31, 2013 Class B Stock Par Value [Member] Genco [Member]	Dec. 31, 2012 Class B Stock Par Value [Member] Genco [Member]	Aug. 01, 2012 Class B Stock Par Value [Member] Genco [Member] Amended Credit Facility [Member]	Mar. 15, 2010 Capital Stock [Member] Genco [Member]
Class of Stock [Line Items]
Issuance of common shares (in shares)	12,650,000	13,800,000	6,419,217	16,300,000											253,000	276,000	128,383
Offering price (in dollars per share)	$ 4.60	$ 4.60	$ 3.60	$ 14.00
Gross proceeds from issuance of common shares				$ 228,200,000
Net proceeds after underwriting commissions and other registration expenses	55,125,000	59,474,000	21,564,000	210,430,000	136,163,000								0
Shares held by parent (in shares)													6,356,471	5,699,088				5,699,088	6,356,471	5,699,088
Ownership interest held (in hundredths)								25.35%	11.05%	24.78%
Subsidiary cumulative percentage ownership threshold necessary to receive additional class B shares from future issuances (in hundredths)												10.00%
Aggregate voting power held (in hundredths)								83.59%	65.08%	83.17%
Capital contribution						75,000,000
Number of shares included in exchange (in shares)																		5,699,088				100
Percentage of additional shares entitled to be received (in hundredths)															2.00%	2.00%	2.00%		2.00%
Maximum borrowing capacity																					1,400,000,000
Convertible notes, stated interest rate (in hundredths)											5.00%
Grace period for scheduled interest payment											30 days
Base salary per year							$ 500