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Basis of Presentation - Accounting for Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Stock-based compensation activity, including both continuing and discontinued operations
Stock-based compensation expense recognized in operating expenses	$ 370	$ 3,141	$ 10,942	$ 8,995
Less: Tax benefit of stock-based compensation expense in provision for income taxes	58	1,112	3,962	3,262
Stock-based compensation expense, net of tax	312	2,029	6,980	5,733
Fair value of shares vested	428	3,088	10,764	9,039
Proceeds to the Company from the exercise of stock-based compensation	2,268	4,166	3,566	6,695
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (1)	0	121	0	140	$ 111
Fair value of financial instruments
Money Market Funds	5,409	13,334	5,409	13,334	$ 2,832
Contingent Consideration	$ 1,314	$ 0	$ 1,314	$ 0
Income Taxes
Effective tax rate (as a percent)	37.00%	34.80%	34.00%	35.90%
Provision for income taxes	$ 16,581	$ 15,898	$ 40,972	$ 40,601
Stock Compensation Plan
Stock-based compensation activity, including both continuing and discontinued operations
Stock-based compensation cost capitalized in inventory	300	$ 500	$ 300	$ 500
Restricted Stock Units
Stock-based compensation activity, including both continuing and discontinued operations
Reversed Stock-Based Compensation Expense	$ 1,600
1994 Plan
Stock-Based Compensation
Requisite service period			4 years
Expiration period			7 years
2011 Plan
Stock-Based Compensation
Maximum common stock shares that may be issued under plan (in shares)	150,000		150,000
2011 Plan | Stock Options
Stock-Based Compensation
Maximum common stock shares that may be issued under plan (in shares)	16,300,000		16,300,000
2011 Plan | Restricted Stock Units
Stock-Based Compensation
Maximum common stock shares that may be issued under plan (in shares)	100,000		100,000

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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