Acquisitions Acquisition - Assets Acquired and Liabilities Assumed (Details) (USD $)	0 Months Ended		12 Months Ended	10 Months Ended
	Mar. 03, 2011	Mar. 03, 2011 Customer Relationships Maximum	Dec. 31, 2011 Customer Relationships Minimum	Dec. 31, 2011 Vocollect Inc.	Mar. 03, 2011 Vocollect Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Contractual Receivable	$ 21,461,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Accounts Receivable				20,569,000	20,569,000
Accounts receivable (gross contractual receivables total to $21,461)				0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory				7,520,000	6,800,000
Inventories				720,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Net Deferred Tax Assets				7,880,000	7,552,000
Net deferred tax assets				328,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Other Current Assets				7,353,000	1,606,000
Other current assets				5,747,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Goodwill				140,162,000	131,167,000
Goodwill (including $7.9 million for assembled workforce)				8,995,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles				67,500,000	85,600,000
Intangible assets				(18,100,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				9,123,000	10,060,000
Property, plant and equipment				(937,000)
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Other Assets				137,000	3,235,000
Other assets				(3,098,000)
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Accounts Payable				(6,818,000)	(6,818,000)
Accounts payable				0
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Payroll and Related Expenses				(8,812,000)	(531,000)
Payroll and related expenses				(8,281,000)
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Deferred Revenue				(10,936,000)	(11,616,000)
Deferred revenue				680,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Accrued Expenses				(8,739,000)	(11,231,000)
Accrued expenses				2,492,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities				(22,570,000)	(35,370,000)
Deferred tax liabilities				12,800,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Long-term Deferred Revenue				(4,282,000)	(4,282,000)
Long-term deferred revenue				0
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Other Long-term Liabilities				(1,370,000)	(370,000)
Other long-term liabilities				(1,000,000)
Business acquisition, assumed liability	1,000,000
Useful life of acquired customer relationships, in years		13 years	11 years
Reduction in the value of customer relationships	18,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				196,717,000	196,371,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred				346,000
Business Combination, Recognized Identiiable Assets Acquired and Liabilities Assumed, Goodwill for Assembled Workforce	$ 7,900,000