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The maximum period of time that can elapse subsequent to a new director's appointment prior to receipt of an initial award in accordance with the plan.

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Represents the number of equal annual installments in which the awards vest when there are performance criteria.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors) for each non-employee director per year, net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan.

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Represents the period of time, from the grant date until the time at which the share-based option award expires.

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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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Aggregate number of common shares reserved for future issuance.

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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 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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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Stock-Based Compensation (Details) (USD $)	3 Months Ended		12 Months Ended
Stock-Based Compensation (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Stock option / award activity
Options outstanding at the beginning of the period (in shares)	1,385,497	2,326,201	2,326,201
Exercised (in shares)	(384,999)	(489,402)
Forfeited (in shares)	(16,667)	(13,473)
Options outstanding at the end of the period (in shares)	983,831	1,823,326	1,385,497	2,326,201
Available for future grant (in shares)	3,496,458	3,344,945	3,515,345
Total shares reserved at the end of period	4,480,289	5,168,271
Options exercisable at the end of period (in shares)	973,831	1,591,330
WEIGHTED-AVERAGE EXERCISE PRICE
Options outstanding at the beginning of the period (in dollars per option)	$ 23.30	$ 27.02	$ 27.02
Exercised (in dollars per option)	$ 20.98	$ 30.32
Forfeited (in dollars per option)	$ 18.22	$ 22.07
Options outstanding at the end of the period (in dollars per option)	$ 24.30	$ 26.17	$ 23.30	$ 27.02
Options exercisable at the end of period (in dollars per option)	$ 24.28	$ 27.23
AVERAGE REMAINING CONTRACTUAL LIFE (in years)
Weighted average remaining contractual life, Options outstanding at the end of the period	2 years 4 months 24 days	2 years 7 months 6 days	2 years 2 months 12 days	2 years 3 months 18 days
Weighted average remaining contractual life, Options exercisable at the end of the period	2 years 4 months 24 days	2 years 3 months 18 days
AGGREGATE INTRINSIC VALUE
Aggregate intrinsic value, Options outstanding at the end of the period	$ 26,852,000	$ 32,057,000
Aggregate intrinsic value, Options exercisable at the end of period	26,629,000	27,184,000
Stock options / awards
Stock-based compensation expense	6,900,000	5,600,000
Intrinsic values of stock options exercised	7,900,000	6,900,000
Stock options
Stock-based compensation
Vesting period	3 years
Stock options / awards
Stock-based compensation expense	201,000	704,000
2011 Equity and Incentive Plan \| Maximum
Stock-based compensation
Expiration period of stock options from date of grant	7 years
Predecessor plans to the 2011 Equity and Incentive Plan \| Minimum
Stock-based compensation
Expiration period of stock options from date of grant	5 years
Predecessor plans to the 2011 Equity and Incentive Plan \| Maximum
Stock-based compensation
Expiration period of stock options from date of grant	10 years
2004 Non-Employee Director Equity Plan and predecessor plans \| Maximum
Stock-based compensation
Expiration period of stock options from date of grant	10 years
Non-Employee Director Stock Plans
Stock options / awards
Stock-based compensation expense	247,000	247,000
2011 Non-Employee Director Stock Plan (the Director Plan)
Stock-based compensation
Number of shares authorized for issuance to each director	3,000
The maximum period of time that can elapse subsequent to a new director's appointment prior to receipt of an initial award in accordance with the plan	30 days
Stock option / award activity
Available for future grant (in shares)	117,830		117,830
Restricted stock units
Stock-based compensation
Number of equal annual installments in which awards vest, with performance criteria	3
Restricted stock units \| Senior executive officers
Stock-based compensation
Number of equal annual installments in which awards vest, with performance criteria	1
Stock options / awards
Stock-based compensation expense	$ 6,400,000	$ 4,700,000