Investments (Number of Securities Included in Loss Position of Current and Noncurrent Investments) (Details)	Jun. 30, 2013 Securities
Current [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	601
12 Months or More	4
Total, number of securities	605
Current [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	108
12 Months or More	2
Total, number of securities	110
Current [Member] | U.S. Government and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	1
12 Months or More	0
Total, number of securities	1
Current [Member] | Obligations of States and Other Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	257
12 Months or More	1
Total, number of securities	258
Current [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	235
12 Months or More	1
Total, number of securities	236
Noncurrent [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	15
12 Months or More	1
Total, number of securities	16
Noncurrent [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	2
12 Months or More	0
Total, number of securities	2
Noncurrent [Member] | Obligations of States and Other Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	8
12 Months or More	0
Total, number of securities	8
Noncurrent [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months	5
12 Months or More	1
Total, number of securities	6