Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Employee stock-based awards
Weighted Average Common Shares Outstanding-Basic (in shares)	285,259,000	263,855,000
Stock-based compensation	$ 7,384	$ 6,549
Stock-based compensation expense (income), net of tax	$ 6,833	$ 5,777
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.02	$ 0.02
Certain options as a percentage of total outstanding options	100.00%
Summary of option activity
Options outstanding balance, end of period (in shares)	4,478,539
Share-Based Compensation, aggregate disclosures
Employee stock-based awards, unrecognized compensation costs on nonvested awards	$ 64,416
Employee stock-based awards, unrecognized compensation costs on nonvested awards, weighted average period of recognition	2 years 4 months 2 days
Continuing Operations
Employee stock-based awards
Stock-based compensation	$ 7,384	$ 6,549
Continuing Operations \| Cost of sales (excluding depreciation and amortization)
Employee stock-based awards
Stock-based compensation	29	28
Continuing Operations \| Selling, general and administrative expenses
Employee stock-based awards
Stock-based compensation	$ 7,355	$ 6,521
Three year vesting options
Employee stock-based awards
Certain options as a percentage of total outstanding options	91.80%
Summary of option activity
Options outstanding balance, end of period (in shares)	4,111,684
Five year vesting options
Employee stock-based awards
Certain options as a percentage of total outstanding options	8.20%
Summary of option activity
Options outstanding balance, end of period (in shares)	366,855
Stock Options
Employee stock-based awards
Weighted average fair value of options granted (in dollars per share)	$ 3.50	$ 4.26
Weighted average assumptions used for grants
Expected volatility (as a percent)	25.40%	25.80%
Risk-free interest rate (as a percent)	2.65%	1.96%
Expected dividend yield (as a percent)	7.00%	6.00%
Expected life of the option	5 years	5 years
Summary of option activity
Options outstanding balance, beginning of period (in shares)	3,671,740
Options granted (in shares)	839,437
Options exercised (in shares)	(20,223)
Options forfeited (in shares)	(9,673)
Options expired (in shares)	(2,742)
Options outstanding balance, end of period (in shares)	4,478,539
Options exercisable balance (in shares)	2,498,039
Options expected to vest (in shares)	1,831,809
Weighted Average Exercise Price
Weighted average exercise price, options outstanding balance beginning of period (in dollars per share)	$ 34.41
Weighted average exercise price, options granted (in dollars per share)	33.72
Weighted average exercise price, options exercised (in dollars per share)	19.41
Weighted average exercise price, options forfeited (in dollars per share)	35.12
Weighted average exercise price, options expired (in dollars per share)	37.71
Weighted average exercise price, options outstanding balance end of period (in dollars per share)	34.34
Weighted average exercise price, options exercisable (in dollars per share)	33.73
Weighted average exercise price, options expected to vest (in dollars per share)	$ 35.12
Weighted average remaining contractual term
Weighted average remaining contractual term, options outstanding	7 years 6 months 29 days
Weighted average remaining contractual term, options exercisable	6 years 4 months 21 days
Weighted average remaining contractual term, options expected to vest	9 years 29 days
Aggregate intrinsic value
Aggregate intrinsic value, options outstanding	$ 8,201
Aggregate intrinsic value, options exercisable	7,815
Aggregate intrinsic value, options expected to vest	367
Aggregate intrinsic value of stock options exercised
Aggregate intrinsic value of stock options exercised	$ 393	$ 1,912
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Percentage of market price for the purchase of shares	95.00%
Employee stock purchase plan, shares available for grant	624,768
Performance units
Dividends accrued
Accrued cash dividends	$ 450	324
Cash dividends paid	$ 644	205
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)	347,576
Vested (in shares)	(79,121)
Forfeited (in shares)	(52,507)
Non-vested at the end of the period (in shares)	683,759
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share)	$ 39.28
Weighted average grant date fair value, granted (in dollars per share)	33.64
Weighted average grant date fair value, vested (in dollars per share)	38.34
Weighted average grant date fair value, forfeited (in dollars per share)	38.28
Weighted average grant date fair value, non-vested, end of period (in dollars per share)	$ 36.60
Total fair value of shares or units vested	$ 3,033	905
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 units \| PUs granted in 2015
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units \| Two Thousand Sixteen [Member] [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units \| Two Thousand Seventeen [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units \| Revenue or revenue growth and return on invested capital
Performance units disclosure
Performance period	3 years
Performance units \| Market condition associated with shareholder return of common stock
Performance units disclosure
Performance period	3 years
Performance units \| Minimum \| Revenue or revenue growth and return on invested capital
Performance units disclosure
Percentage payout rate	0.00%
Performance units \| Minimum \| Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	0.00%
Performance units \| Maximum \| Revenue or revenue growth and return on invested capital
Performance units disclosure
Percentage payout rate	200.00%
Performance units \| Maximum \| Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	200.00%
Original PU 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)	347,576
Vested (in shares)	(79,121)
Forfeited (in shares)	(2,626)
Non-vested at the end of the period (in shares)	983,707
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)
Restricted Stock Units
Employee stock-based awards
Accrued cash dividends	$ 721	683
Dividends accrued
Cash dividends paid	$ 2,043	1,855
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)	611,030
Vested (in shares)	(436,489)
Forfeited (in shares)	(24,035)
Non-vested at the end of the period (in shares)	1,221,975
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share)	$ 35.38
Weighted average grant date fair value, granted (in dollars per share)	33.58
Weighted average grant date fair value, vested (in dollars per share)	35.12
Weighted average grant date fair value, forfeited (in dollars per share)	36.43
Weighted average grant date fair value, non-vested, end of period (in dollars per share)	$ 34.55
Total fair value of shares or units vested	$ 15,330	$ 14,026
Restricted Stock Units \| Minimum
Employee stock-based awards
Award vesting period	3 years

The amount of cash dividends accrued in current liabilities.

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Impact of stock-based compensation expense on basic and diluted earnings per share.

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Represents the percentage of achievement of the predefined revenue and ROIC targets.

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Represents the percentage of achievement rate for performance units that is used as basis of payouts under the plan.

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This element represents the period of time over which the entity's performance is evaluated for purposes of calculating the number of performance shares earned.

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Represents certain options as a percentage of total outstanding options.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of paid and unpaid cash dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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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 which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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