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Common Stock and Stock-Based Compensation Stockholders Equity (Policies)
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Stockholders' Equity, Policy [Policy Text Block]
Stockholders' Equity
In March 2019, our Board of Directors authorized a share repurchase program effective March 7, 2019 through December 31, 2020. The share repurchase program authorizes the Company to repurchase up to $350.0 million of its common stock, not to exceed 13.7 million shares. On April 24, 2020, as a result of current market conditions, the Board of Directors amended the repurchase program to remove the share limitation. Share repurchase activity under the current program is as follows:
 
Shares Repurchased
 
Remaining Authorization to Repurchase
Period
Number of shares
 
Cost
(in millions)
 
Cost
(in millions)
March 7, 2019 Authorization
 
 
 
 
$
350.0

March 7, 2019 through March 31, 2019
866,715

 
$
19.0

 
$
331.0

April 1, 2019 through June 30, 2019
2,133,116

 
44.0

 
$
287.0

July 1, 2019 through September 30, 2019
5,171,489

 
100.9

 
$
186.1

October 1, 2019 through December 31, 2019
2,933,474

 
60.8

 
$
125.3

January 1, 2020 through March 31, 2020
1,850,000

 
35.4

 
$
89.9

Total
12,954,794

 
$
260.1

 
 

Additionally, for the three months ended March 31, 2019, repurchases include 2.6 million shares at a cost of approximately $70.0 million representing the final settlement of an accelerated share repurchase program, which was funded in November 2018 but a portion of which remained outstanding as of December 31, 2018.
Share-based Payment Arrangement [Text Block]
Stock-Based Compensation
Stock-based compensation totaled approximately $7.3 million and $5.5 million for the three months ended March 31, 2020 and 2019, respectively. The Company's annual grant of share-based awards generally occurs in the second quarter under our 2004 Fourth Amended and Restated Stock Option and Incentive Plan (the "Plan”). Our stock options have contractual terms of ten years. Expense related to stock options issued to eligible employees under the Plan is recognized over their vesting period on a straight-line basis, generally three years. Expense related to restricted stock units ("RSUs") issued to eligible employees under the Plan is recognized ratably over the vesting period, generally between three years and four years. Expense related to performance units is recognized ratably from their award date to the end of the performance period, generally three years. Expense related to restricted stock awards ("RSAs") and RSUs granted to non-employee directors under the Plan is recognized ratably over the vesting period, generally one year.
The following table summarizes stock-based compensation awards granted during the three months ended March 31, 2020:
 
Number of Shares Granted
 
Weighted Average Grant-Date Fair Value per Award
Stock options
300,000

 
$
5.26

Restricted stock units
119,012

 
$
21.26

The fair value of the stock options granted was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
 
Three Months Ended March 31, 2020
Exercise price
$
21.61

Risk-free interest rate
1.48
%
Expected life (in years)
6.50

Equity volatility
35.0
%
Dividend yield
3.42
%