Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash	$ 18,242	$ 192,642
Restricted cash	46	2,211
Accounts receivable, net	102,071	88,111
Accounts receivable affiliates	3,611	6,614
Fair value of derivatives	9,147	1,521
Deferred income taxes	13,388	22,374
Assets held for sale - current	5,375	7,661
Prepaid expenses and other current assets	5,329	4,679
Total current assets	157,209	325,813
Properties and equipment, net	1,783,797	1,484,638
Assets held for sale - non-current	176,694	178,484
Fair value of derivatives	18,039	4,503
Other assets	42,770	31,765
Total Assets	2,178,509	2,025,203
Current liabilities:
Accounts payable	106,728	101,688
Accounts payable affiliates	0	41
Production tax liability	23,872	22,232
Fair value of derivatives	2,356	14,689
Funds held for distribution	37,413	31,040
Accrued interest payable	19,717	9,033
Liabilities held for sale - current	3,070	12,069
Other accrued expenses	53,222	22,628
Total current liabilities	246,378	213,420
Long-term debt	675,913	604,990
Deferred income taxes	124,762	118,767
Asset retirement obligation	39,564	37,638
Fair value of derivatives	2,241	2,842
Liabilities held for sale - non-current	61,543	55,915
Other liabilities	26,085	24,037
Total liabilities	1,176,486	1,057,609
Commitments and contingent liabilities
Shareholders' Equity:
Preferred shares - par value $0.01 per share, 50,000,000 shares authorized,none issued	0	0
Common shares - par value $0.01 per share, 150,000,000 authorized, 35,894,186 and 35,675,656 issued as of September 30, 2014 and December 31, 2013, respectively	359	357
Additional paid-in capital	686,045	674,211
Retained earnings	316,950	293,267
Treasury shares - at cost, 18,580 and 5,508 as of March 31, 2014 and December 31, 2013, respectively	(1,331)	(241)
Total shareholders' equity	1,002,023	967,594
Total Liabilities and Shareholders' Equity	$ 2,178,509	$ 2,025,203