Discontinued Operations (Carrying Amounts Of Assets Included As Part of Discontinued Operations) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Carrying amounts of assets included as part of discontinued operations
Cash and cash equivalents			$ 143
Accounts receivable, net			157,680
Inventories			82,952
Prepaid expenses and other current assets			2,350
Current assets classified as discontinued operations	$ 0	$ 243,575	243,125
Property and equipment, net			3,311
Intangibles, net			4,348
Goodwill			21,149
Other non-current assets			12,318
Non-current assets classified as discontinued operations	0	42,566	41,126
Total assets classified as discontinued operations on the consolidated balance sheet			284,251
Carrying amounts of liabilities included as part of discontinued operations:
Accounts payable			20,711
Accrued employee compensation			3,231
Other accrued liabilities			72,649
Deferred revenue			34,072
Current liabilities classified as discontinued operations	0	135,329	130,663
Other non-current liabilities			13,333
Non-current liabilities classified as discontinued operations	$ 0	$ 13,092	13,333
Total liabilities classified as discontinued operations on the consolidated balance sheet			$ 143,996