Income Taxes (Effective Income Tax Expense (Benefit) Rate) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax [Line Items]
Federal statutory tax expense (benefit) rate	35.00%	35.00%	35.00%
State tax expense (benefit), net of federal benefit	1.90%	(69.80%)	3.20%
Depletion in excess of basis	(0.30%)	(14.70%)	(0.20%)
Effective Income Tax Rate Reconciliation, Tax Settlements, Domestic	0.00%	0.00%	(4.70%)
Valuation allowances	(35.80%)	89.80%	(30.30%)
Effective Income Tax Rate Reconciliation Change in Deferred Tax Assets, Valuation Allowance Due to Foreign Taxes	0.00%	(19.80%)	(8.20%)
Foreign taxes	1.20%	(10.80%)	3.70%
Intraperiod allocation	0.00%	4.50%	4.60%
Change in unrecognized tax benefits	(0.40%)	(30.10%)	5.10%
Effective Income Tax Rate Reconciliation Nondeductible Expense Disallowed Compensation	0.10%	11.70%	0.40%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	0.10%	8.60%	0.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	0.10%	3.30%	0.30%
Permanent differences and other items	0.40%	4.80%	(0.40%)
Effective income tax expense (benefit) rate	2.30%	12.50%	8.70%