Income Taxes (Schedule of Amounts Previously Reported in 2013 Consolidated Balance Sheet, Correction, and 2013 Amounts in Accompanying Consolidated Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred taxes		$ 13,873
Taxes receivable and deferred	59,022	103,185
Total		117,058
Taxes payable and deferred	575	3,855
Deferred taxes and other credits		46,690
Total		50,545
Taxes receivable	10,518	16,427
Taxes payable	2,211	1,536
Tax reserves		7,786
Tax payable, and tax reserves		9,322
Deferred taxes	6,743	12,905
Taxes receivable and deferred	69,540	79,849
Total		92,754
Taxes payable and deferred	2,786	4,429
Deferred taxes and other credits	7,163	14,707
Total		19,136
Error in the presentation of deferred tax assets and liabilities in balance sheets [Member] | Total as previously reported in Balance Sheet [Member]
Deferred taxes		13,873
Taxes receivable and deferred		119,612
Total		133,485
Taxes payable and deferred		5,391
Deferred taxes and other credits		54,476
Total		59,867
Error in the presentation of deferred tax assets and liabilities in balance sheets [Member] | Amount of revision [Member]
Deferred taxes		(968)
Taxes receivable and deferred		(39,763)
Total		(40,731)
Taxes payable and deferred		(962)
Deferred taxes and other credits		(39,769)
Total		$ (40,731)