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Percentage of shares to be settled as per peer group of share-based compensation awards.

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Threshold number of specified trading days that common stock price to be considered for average share value for share based compensation during the performance period.

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No definition available.

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

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Weighted average expected volatility rate of share-based compensation awards.

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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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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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General - Stock Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) company $ / shares shares	Sep. 30, 2017 USD ($)
Stock options, Non vested restricted stock awards and nonvested restricted stock units
Stock compensation expense \| $	$ 9,320	$ 10,323	$ 27,405	$ 31,834
Benefits of tax deductions in excess of recognized stock compensation expense \| $			$ 5,000	$ 3,700
Minimum
Stock options, Non vested restricted stock awards and nonvested restricted stock units
Estimated forfeitures (as a percent)	0.00%	0.00%	0.00%	0.00%
Maximum
Stock options, Non vested restricted stock awards and nonvested restricted stock units
Estimated forfeitures (as a percent)	4.00%	4.00%	4.00%	4.00%
Stock options
Stock options, Non vested restricted stock awards and nonvested restricted stock units
Grants in period, weighted average grant date fair value (in dollars per share)			$ 25.86
Expected volatility (as a percent)			28.21%
Stock option activity
Outstanding, beginning of period (in shares) \| shares			2,458,237
Granted (in shares) \| shares			451,456
Forfeited (in shares) \| shares			(59,427)
Exercised (in shares) \| shares			(400,869)
Outstanding, end of period (in shares) \| shares	2,449,397		2,449,397
Vested and expected to vest end of period (in shares) \| shares	2,434,842		2,434,842
Exercisable, end of period (in shares) \| shares	1,512,481		1,512,481
Weighted average exercise price of stock options
Outstanding, beginning of period (in dollars per share)			$ 61.50
Granted (in dollars per share)			98.45
Forfeited (in dollars per share)			77.53
Exercised (in dollars per share)			56.35
Outstanding, end of period (in dollars per share)	$ 68.77		68.77
Vested and expected to vest end of period (in dollars per share)	68.66		68.66
Exercisable, end of period (in dollars per share)	$ 60.31		$ 60.31
Assumptions used for estimating value of awards granted
Vesting period			3 years
Life of options (Expiration period)			10 years
Restricted stock awards
Nonvested restricted stock awards and units
Outstanding, beginning of period (in shares) \| shares			31,102
Awarded (in shares) \| shares			11,795
Vested (in shares) \| shares			(31,102)
Outstanding, end of period (in shares) \| shares	11,795		11,795
Weighted average exercise price of nonvested restricted stock award and units
Outstanding, beginning of period (in dollars per share)			$ 68.00
Awarded (in dollars per share)			89.05
Vested (in dollars per share)			68.00
Outstanding, end of period (in dollars per share)	$ 89.05		$ 89.05
Restricted stock awards \| Minimum
Assumptions used for estimating value of awards granted
Vesting period			12 months
Restricted stock awards \| Maximum
Assumptions used for estimating value of awards granted
Vesting period			24 months
Restricted Stock Units (RSUs)
Nonvested restricted stock awards and units
Outstanding, beginning of period (in shares) \| shares			163,289
Awarded (in shares) \| shares			111,033
Vested (in shares) \| shares			(82,207)
Forfeited (in shares) \| shares			(18,231)
Outstanding, end of period (in shares) \| shares	173,884		173,884
Weighted average exercise price of nonvested restricted stock award and units
Outstanding, beginning of period (in dollars per share)			$ 66.46
Awarded (in dollars per share)			99.29
Vested (in dollars per share)			65.54
Forfeited (in dollars per share)			83.93
Outstanding, end of period (in dollars per share)	$ 86.03		$ 86.03
Assumptions used for estimating value of awards granted
Vesting period			3 years
Performance Based Restricted Stock Units (“PSUs”)
Nonvested restricted stock awards and units
Outstanding, beginning of period (in shares) \| shares			202,315
Awarded (in shares) \| shares			80,502
Vested (in shares) \| shares			(33,592)
Forfeited (in shares) \| shares			(1,865)
Outstanding, end of period (in shares) \| shares	247,360		247,360
Weighted average exercise price of nonvested restricted stock award and units
Outstanding, beginning of period (in dollars per share)			$ 84.63
Awarded (in dollars per share)			141.61
Vested (in dollars per share)			85.00
Forfeited (in dollars per share)			97.25
Outstanding, end of period (in dollars per share)	$ 103.03		$ 103.03
Assumptions used for estimating value of awards granted
Vesting period			3 years
Expected dividend yield (as a percent)			0.00%
Risk-free interest rate (as a percent)			2.37%
Expected volatility, minimum (as a percent)			20.00%
Expected volatility, maximum (as a percent)			82.00%
Expected volatility, average (as a percent)			35.00%
Number of trading days considered for average share value			30 days
Number of companies in peer group \| company			49
Performance Based Restricted Stock Units (“PSUs”) \| Minimum
Assumptions used for estimating value of awards granted
Percentage of shares to be settled			0.00%
Performance Based Restricted Stock Units (“PSUs”) \| Maximum
Assumptions used for estimating value of awards granted
Percentage of shares to be settled			200.00%