Equity (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended							9 Months Ended				9 Months Ended
	May 30, 2013	Nov. 19, 2013	Sep. 30, 2013	Sep. 30, 2013 Employee Stock Purchase Plan[Member]	Sep. 30, 2013 Warrants Issued On Emergence Date [Member]	Sep. 30, 2013 Warrants Subsequently Issued In Settlement Of Pre-Petition Claims [Member]	Sep. 30, 2013 Class A [Member]	Sep. 30, 2013 Class B [Member]	Sep. 30, 2013 Shares Issued On Emergence Date [Member]	Sep. 30, 2013 Shares Subsequently Issued In Settlement Of Pre-Petition Claims [Member]	Sep. 30, 2013 Issuance of Shares Under Employee and Director Compensation Programs [Member]		Sep. 30, 2013 Warrant [Member]	Sep. 30, 2013 Semcrude Pipeline [Member]	Sep. 30, 2013 2013 Q2 [Member]	Sep. 30, 2013 2013 Q3 [Member] [Member]	Sep. 30, 2013 2013 Q4 [Member]
Equity [Line Items]
Common Stock, Dividends, Per Share, Declared																	$ 0.21
Dividends Payable, Date to be Paid																	Dec. 03, 2013
EQUITY (Textual) [Abstract]
Equity Method Investment, Ownership Percentage														33.00%
Income tax expense, related to change in benefit plans			$ 46
Common stock shares issued			42,530,641						40,882,496	226,016	689,320	[1]
Shares To Be Issued To Settle Prepetition Claims										517,500
Vested common stock											105,738
Shares of vested stock awards sold back to satisfy tax obligations			8,591
Par value per share			$ 0.01				$ 0.01	$ 0.01
Common stock shares authorized							90,000,000	10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			201,451
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Potentialy Vest			141,000
Deferred Compensation Liability, Classified, Noncurrent			$ 78
Number of Class A shares equal to unvested dividend rights			1,366
Share Price			$ 57.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			534,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 52.78
Warrants issued			1,360,823		1,634,210	237,897
Class of Warrant or Right, To Be Issued						544,737
Warrants exercised during period			772,817
Stock Issued During Period, Shares, Conversion of Convertible Securities													425,618
Price of purchase of one share of common stock against warrant			25
Limitation on ESPP shares per employee per offering period				12,500
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date				85.00%
Common Stock, Capital Shares Reserved for Future Issuance				1,000,000
Common Stock, Dividends, Per Share, Cash Paid	$ 0.19	$ 0.20
Dividends Payable, Date of Record															May 20, 2013	Aug. 19, 2013	Nov. 22, 2013
Dividends Payable, Date Declared																	Nov. 06, 2013

[1] (*) These shares include 105,738 shares which vested during the nine months ended September 30, 2013. Of these vested shares, recipients sold back to the Company 8,591 shares to satisfy tax withholding obligations which are being recognized at cost as treasury stock on the condensed consolidated balance sheet.