Condensed Consolidated Balance Sheets - Entity [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 435,574	$ 218,403	$ 313,370	$ 76,970
Accounts receivable	540,227	551,269
Accounts receivable - affiliate	1,831	3,223
Inventories	1,306,414	1,102,261
Prepaid expense and other current assets	28,283	32,157
Total current assets	2,312,329	1,907,313
Property, plant and equipment, net	1,819,012	1,806,060
Deferred charges and other assets, net	306,290	330,517
Total assets	4,437,631	4,043,890
Current liabilities:
Accounts payable	353,716	335,182
Accounts payable - affiliate	20,333	11,630
Accrued expenses	1,246,805	1,129,970
Deferred revenue	7,218	1,227
Total current liabilities	1,628,072	1,478,009
Delaware Economic Development Authority loan	8,000	8,000
Long-term debt	745,034	742,349
Intercompany notes payable	152,287	122,264
Other long-term liabilities	70,154	62,752
Total liabilities	$ 2,603,547	$ 2,413,374
Commitments and contingencies (Note 8)
Equity:
Member's equity	$ 1,129,834	$ 1,144,100
Retained earnings	730,330	513,292
Accumulated other comprehensive loss	(26,080)	(26,876)
Total equity	1,834,084	1,630,516
Total liabilities and equity	$ 4,437,631	$ 4,043,890