Business Segments (Summarized Geographic Information Related to the Company's Long-lived Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Long-Lived Assets	$ 11,817,094	[1],[2]	$ 10,153,065	[1],[2]
UNITED STATES
Long-Lived Assets	7,558,076	[2]	7,053,599	[2]
International [Member]
Long-Lived Assets	4,259,018	[2],[3]	3,099,466	[2],[3]
International [Member] | BRAZIL
Long-Lived Assets	909,330	[2],[3]	695,923	[2],[3]
International [Member] | CHILE
Long-Lived Assets	196,387	[2],[3]	178,670	[2],[3]
International [Member] | COLOMBIA
Long-Lived Assets	380,326	[2],[3]	316,096	[2],[3]
International [Member] | GERMANY
Long-Lived Assets	539,670	[2],[3]	0	[2],[3]
International [Member] | GHANA
Long-Lived Assets	377,553	[2],[3]	427,759	[2],[3]
International [Member] | INDIA
Long-Lived Assets	676,049	[2],[3]	671,091	[2],[3]
International [Member] | MEXICO
Long-Lived Assets	709,341	[2],[3]	546,678	[2],[3]
International [Member] | PERU
Long-Lived Assets	65,756	[2],[3]	63,956	[2],[3]
International [Member] | SOUTH AFRICA
Long-Lived Assets	230,833	[2],[3]	199,293	[2],[3]
International [Member] | UGANDA
Long-Lived Assets	$ 173,773	[2],[3]	$ 0	[2],[3]

[1] December 31, 2011 balances have been revised to reflect purchase accounting measurement period adjustments.

[2] Balances have been revised to reflect purchase accounting measurement period adjustments.

[3] Balances are translated at the applicable period end exchange rate and therefore may impact comparability between periods.