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Summary of Significant Accounting Policies - Stock-Based Compensation and Income Taxes (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) offering_period $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Employee stock-based awards
Stock-based compensation | $	$ 31,167	$ 30,019	$ 28,976
Stock-based compensation expense (income), net of tax | $	$ 28,998	$ 26,512	$ 22,364
Stock-based compensation expense per basic and diluted share (in dollars per share) | $ / shares	$ 0.10	$ 0.10	$ 0.09
Certain options as a percentage of total outstanding options	100.00%
Total amount of shares of common stock reserved and available for issuance pursuant to awards granted under the 2014 Plan (in shares)	48,253,839
Summary of option activity
Options outstanding balance, end of period (in shares)	4,271,834
Employee Stock Purchase Plan
Employee stock purchase plan, shares available for grant	6,053,429
Employee stock-based awards, unrecognized compensation costs on nonvested awards | $	$ 43,248
Employee stock-based awards, weighted average recognition period	1 year 10 months 17 days
Share-based Compensation Award, Tranche Two
Employee stock-based awards
Certain options as a percentage of total outstanding options	7.20%
Summary of option activity
Options outstanding balance, end of period (in shares)	306,816
Share-based Compensation Award, Tranche One
Employee stock-based awards
Certain options as a percentage of total outstanding options	92.80%
Summary of option activity
Options outstanding balance, end of period (in shares)	3,965,018
Continuing Operations
Employee stock-based awards
Stock-based compensation | $	$ 31,167	$ 30,019	$ 28,976
Continuing Operations | Cost of sales (excluding depreciation and amortization)
Employee stock-based awards
Stock-based compensation | $	119	108	110
Continuing Operations | Selling, general and administrative expenses
Employee stock-based awards
Stock-based compensation | $	$ 31,048	$ 29,911	28,866
Performance Units Original Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	717,878
Granted (in shares)	353,507
Vested (in shares)	(81,305)
Forfeited (in shares)	(23,031)
Non-vested at the end of the period (in shares)	967,049	717,878
Restricted Stock Units (RSUs)
Dividends accrued and paid
Accrued cash dividends | $	$ 2,899	$ 2,590	2,525
Cash dividends paid | $	2,477	2,370	2,363
Total fair value of shares or units vested | $	$ 20,454	$ 19,825	22,236
PUs Adjustment
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	(250,067)
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(49,881)
Non-vested at the end of the period (in shares)	(299,948)	(250,067)
Performance Shares [Member]
Dividends accrued and paid
Accrued cash dividends | $	$ 1,804	$ 1,290	1,078
Cash dividends paid | $	644	205	645
Total fair value of shares or units vested | $	$ 3,117	$ 1,242	$ 5,748
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	467,811
Granted (in shares)	353,507
Vested (in shares)	(81,305)
Forfeited (in shares)	(72,912)
Non-vested at the end of the period (in shares)	667,101	467,811
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share) | $ / shares	$ 39.28
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	33.64
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	38.34
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	38.01
Weighted average grant date fair value, non-vested, end of period (in dollars per share) | $ / shares	$ 36.54	$ 39.28
Performance units disclosure
Period of anniversary from the date of grant	3 years
Qualifying age for grant of performance units	55 years
Qualifying service period	10 years
Performance Shares [Member] | Two Thousand Sixteen
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	65.00%
Performance Shares [Member] | Two Thousand Seventeen
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance Shares [Member] | Two Thousand Eighteen
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance Shares [Member] | Revenue or revenue growth and return on invested capital
Performance units disclosure
Performance period	3 years
Performance Shares [Member] | Market condition associated with shareholder return of common stock
Performance units disclosure
Performance period	3 years
Performance Shares [Member] | Minimum | Predefined Targets Of Revenue And Return On Invested Capital Or Adjusted EBITDA [Member]
Performance units disclosure
Percentage payout rate	0.00%
Performance Shares [Member] | Minimum | Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	0.00%
Performance Shares [Member] | Maximum | Predefined Targets Of Revenue And Return On Invested Capital Or Adjusted EBITDA [Member]
Performance units disclosure
Percentage payout rate	200.00%
Performance Shares [Member] | Maximum | Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	200.00%
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Employee stock purchase plan, number of offering periods | offering_period	2
Employee stock purchase plan, duration of offering periods	6 months
Employee stock purchase plan, maximum employee subscription rate percent	15.00%
Percentage of market price for the purchase of shares	95.00%
Employee stock purchase plan, shares issued in period	119,123	102,826	110,835
Employee stock purchase plan, shares available for grant	505,645
Three Year Vesting Option [Member]
Employee stock-based awards
Award vesting period	3 years
Contractual term of awards	10 years
Five Year Vesting Option [Member]
Employee stock-based awards
Award vesting period	5 years
Contractual term of awards	10 years
Stock And Cash Incentive Plan2014 [Member]
Employee stock-based awards
Total amount of shares of common stock reserved and available for issuance pursuant to awards granted under the 2014 Plan (in shares)	12,750,000
Employee And Non Employees Stock Option [Member]
Employee stock-based awards
Weighted average fair value of options granted (in dollars per share) | $ / shares	$ 3.50	$ 4.28	$ 2.56
Weighted average assumptions used for grants
Expected volatility (as a percent)	25.40%	25.70%	27.20%
Risk-free interest rate (as a percent)	2.65%	1.96%	1.32%
Expected dividend yield (as a percent)	7.00%	6.00%	7.00%
Expected life of the option	5 years	5 years	5 years 7 months 6 days
Summary of option activity
Options outstanding balance, beginning of period (in shares)	3,671,740
Options granted (in shares)	846,517
Options exercised (in shares)	(182,607)
Options forfeited (in shares)	(47,754)
Options expired (in shares)	(16,062)
Options outstanding balance, end of period (in shares)	4,271,834	3,671,740
Options exercisable balance (in shares)	2,393,010
Options expected to vest (in shares)	1,808,321
Weighted Average Exercise Price
Weighted average exercise price, options outstanding balance beginning of period (in dollars per share) | $ / shares	$ 34.41
Weighted average exercise price, options granted (in dollars per share) | $ / shares	33.71
Weighted average exercise price, options exercised (in dollars per share) | $ / shares	22.36
Weighted average exercise price, options forfeited (in dollars per share) | $ / shares	34.69
Weighted average exercise price, options expired (in dollars per share) | $ / shares	34.69
Weighted average exercise price, options outstanding balance end of period (in dollars per share) | $ / shares	34.78	$ 34.41
Weighted average exercise price, options exercisable (in dollars per share) | $ / shares	34.51
Weighted average exercise price, options expected to vest (in dollars per share) | $ / shares	$ 35.10
Weighted average remaining contractual term
Weighted average remaining contractual term, options outstanding	7 years 11 days
Weighted average remaining contractual term, options exercisable	5 years 11 months 19 days
Weighted average remaining contractual term, options expected to vest	8 years 4 months 10 days
Aggregate intrinsic value
Aggregate intrinsic value, options outstanding | $	$ 6,066
Aggregate intrinsic value, options exercisable | $	5,785
Aggregate intrinsic value, options expected to vest | $	279
Aggregate intrinsic value of stock options exercised
Aggregate intrinsic value of stock options exercised | $	$ 2,181	$ 8,485	$ 18,298
Restricted Stock And Restricted Stock Units [Member]
Employee stock-based awards
Award vesting period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	1,071,469
Granted (in shares)	814,659
Vested (in shares)	(582,687)
Forfeited (in shares)	(106,875)
Non-vested at the end of the period (in shares)	1,196,566	1,071,469
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share) | $ / shares	$ 35.38
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	33.59
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	35.10
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	34.92
Weighted average grant date fair value, non-vested, end of period (in dollars per share) | $ / shares	$ 34.33	$ 35.38
Performance Units Original Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Granted (in shares)		229,692	231,672

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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