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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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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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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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Percentage of vesting of share-based compensation awards.

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Number of share options (or share units) exercised during the current period.

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Share-Based Compensation , Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		12 Months Ended
	Mar. 31, 2016	Apr. 30, 2015	Feb. 28, 2015	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 20, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Stock Options Exercised						$ 149	$ 95	$ 127
Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant									1,542,500
Number of Shares Authorized									1,750,000
Director Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Available for Grant							43,474
Number of Shares Authorized							175,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares						227,800	216,800	117,250
Weighted Average Grant Date Fair Value		$ 63.81				$ 69.43	$ 64.32	$ 49.97
Share-based Compensation Expense						$ 9,600	$ 7,100	$ 4,900
Restricted Stock [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares					130,000	81,000	6,000
Weighted Average Grant Date Fair Value					$ 69.25	$ 69.70	$ 66.10
Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares		145,000					45,000
Weighted Average Grant Date Fair Value							$ 65.00
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercises in Period						(20,000)	(8,000)	(12,250)
2004 non-employee plan [Member] \| Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Stock Options Exercised						$ 100
Exercises in Period						(14,199)
Director [Member] \| Restricted Stock [Member] \| Director Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares	16,800		19,800
Weighted Average Grant Date Fair Value	$ 69.45		$ 65.87
Share-based Compensation Award, Tranche Six [Member] \| Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares		72,500			65,000
Share-based Compensation Award, Tranche Two [Member] \| Restricted Stock [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage				35.00%	30.00%	35.00%
Share-based Compensation Award, Tranche Two [Member] \| Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage		30.00%					35.00%
Share-based Compensation Award, Tranche Three [Member] \| Restricted Stock [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage				20.00%	35.00%	20.00%
Share-based Compensation Award, Tranche Three [Member] \| Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage		35.00%					20.00%
Share-based Compensation Award, Tranche Four [Member] \| Restricted Stock [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage				5.00%	10.00%	5.00%
Share-based Compensation Award, Tranche Four [Member] \| Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage		10.00%					5.00%
Share-based Compensation Award, Tranche Five [Member] \| Restricted Stock [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage				5.00%	5.00%	5.00%
Share-based Compensation Award, Tranche Five [Member] \| Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage		5.00%					5.00%
Share-based Compensation Award, Tranche One [Member] \| Restricted Stock [Member] \| Two Thousand Fifteen Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage				35.00%	20.00%	35.00%
Share-based Compensation Award, Tranche One [Member] \| Restricted Stock [Member] \| 2009 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage		20.00%					35.00%