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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted-Average Assumptions Used to Estimate Grant Date Fair Values for Stock Options Granted | Weighted-average assumptions used to estimate the grant date fair values for stock options granted for the three month period ended March 31, 2016 follow:
| Three Months Ended |
| March 31, |
| 2016 |
Volatility |  | 39.52 | %
Expected term (in years) |  | 5.00 |
Dividend yield |  | 2.65 | %
Risk-free interest rate |  | 1.76 | %
Stock Option Activity | Stock option activity from January 1, 2017 to March 31, 2017 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average |
| Underlying |  |  | Exercise Price |
| Shares |  |  | Per Share |
Outstanding at January 1, 2017 |  | 6,687,150 |  |  | $ | 20.68 |
Exercised |  | (10,000 | ) |  | $ | 22.29 |
Outstanding at March 31, 2017 |  | 6,677,150 |  |  | $ | 20.68 |
Exercisable at March 31, 2017 |  | 5,466,836 |  |  | $ | 21.02 |
Restricted Stock Activity | Restricted stock activity from January 1, 2017 to March 31, 2017 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average Grant |
|  |  |  |  | Date Fair Value |
| Shares |  |  | Per Share |
Non-vested restricted stock outstanding at January 1, 2017 |  | 1,427,455 |  |  | $ | 22.26 |
Granted |  | 32,500 |  |  | $ | 26.92 |
Vested |  | (53,021 | ) |  | $ | 23.54 |
Forfeited |  | (8,602 | ) |  | $ | 23.20 |
Non-vested restricted stock outstanding at March 31, 2017 |  | 1,398,332 |  |  | $ | 22.31 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2017 to March 31, 2017 follows:
|  |  |  |  | Weighted |
|  |  |  |  | Average Grant |
|  |  |  |  | Date Fair Value |
| Shares |  |  | Per Share |
Non-vested restricted stock units outstanding at January 1, 2017 |  | 191,655 |  |  | $ | 19.85 |
Forfeited |  | (852 | ) |  | $ | 19.03 |
Non-vested restricted stock units outstanding at March 31, 2017 |  | 190,803 |  |  | $ | 19.86 |
Performance Units | The total target number of shares with respect to the Performance Units for the awards in 2013-2016 is set forth below:
| 2016 |  |  | 2015 |  |  | 2014 |  |  | 2013 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 185,000 |  |  |  | 190,600 |  |  |  | 154,000 |  |  |  | 236,500 |
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2016 |  |  | 2015 |  |  | 2014 |  |  | 2013 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Fair value at date of grant | $ | 3,854 |  |  | $ | 4,052 |  |  | $ | 5,388 |  |  | $ | 5,564 |
Compensation Expense Associated with Performance Units | These fair value amounts are charged to expense on a straight-line basis over the performance period. Compensation expense associated with the Performance Units is shown below (in thousands):
| 2016 |  |  | 2015 |  |  | 2014 |  |  | 2013 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended March 31, 2017 | $ | 321 |  |  | $ | 338 |  |  | $ | 449 |  |  | NA |
Three months ended March 31, 2016 | NA |  |  | $ | 338 |  |  | $ | 449 |  |  | $ | 464 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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