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Consolidated Statements of Changes in Stockholders' Equity - USD ($) | Common Stock [Member] Common Class A [Member] | Common Stock [Member] Common Class B [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Common Class A [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance, shares (in shares) at Dec. 31, 2012 | 22,916,000 | 2,762,000 |  |  |  |  |
Balance at Dec. 31, 2012 | $ 268,801,000 | $ 343,000 | $ 12,399,000 | $ (2,615,000) | $ 149,173,000 |  | $ 428,101,000
Net income |  |  |  |  | 106,000,000 |  | 106,000,000
Gain on cash flow hedges, net of tax expense of |  |  |  | 1,077,000 |  |  | 1,077,000
Issuance of stock in connection with employee stock plans (in shares) | 283,000 |  |  |  |  |  |
Issuance of stock in connection with employee stock plans | $ 5,149,000 |  |  |  |  |  | 5,149,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 117,000 |  |  |  |  |  |
Repurchase of Class A common stock (in shares) | (187,000) |  |  |  |  | (127,900) |
Repurchase of Class A common stock | $ (7,903,000) |  |  |  |  |  | (7,903,000)
Class B common stock converted to Class A common stock (in shares) | 200,000 | (200,000) |  |  |  |  |
Class B common stock converted to Class A common stock | $ 24,000 | $ (24,000) |  |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | $ 2,184,000 |  | 10,199,000 |  |  |  | 12,383,000
Dividends paid |  |  |  |  | (10,085,000) |  | (10,085,000)
Balance, shares (in shares) at Dec. 31, 2013 | 23,329,000 | 2,562,000 |  |  |  |  |
Balance at Dec. 31, 2013 | $ 268,255,000 | $ 319,000 | 22,598,000 | (1,538,000) | 245,088,000 |  | $ 534,722,000
Issuance of stock in connection with acquisitions |  |  |  |  |  |  |
Net income |  |  |  |  | 138,720,000 |  | $ 138,720,000
Gain on cash flow hedges, net of tax expense of |  |  |  | 612,000 |  |  | 612,000
Issuance of stock in connection with employee stock plans (in shares) | 118,000 |  |  |  |  |  |
Issuance of stock in connection with employee stock plans | $ 4,590,000 |  |  |  |  |  | 4,590,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 288,000 |  |  |  |  |  |
Repurchase of Class A common stock (in shares) | (333,000) |  |  |  |  | (226,729) |
Repurchase of Class A common stock | $ (22,968,000) |  |  |  |  |  | (22,968,000)
Compensation for stock and stock option issuances and excess tax benefits from option exercises | $ 6,445,000 |  | 7,177,000 |  |  |  | 13,622,000
Dividends paid |  |  |  |  | (15,929,000) |  | (15,929,000)
Balance, shares (in shares) at Dec. 31, 2014 | 23,671,000 | 2,562,000 |  |  |  |  |
Balance at Dec. 31, 2014 | $ 276,058,000 | $ 319,000 | 29,775,000 | (926,000) | 367,879,000 |  | 673,105,000
Issuance of stock in connection with acquisitions (in shares) | 269,000 |  |  |  |  |  |
Issuance of stock in connection with acquisitions | $ 19,736,000 |  |  |  |  |  | 19,736,000
Net income |  |  |  |  | 182,999,000 |  | 182,999,000
Gain on cash flow hedges, net of tax expense of |  |  |  | 649,000 |  |  | 649,000
Issuance of stock in connection with employee stock plans (in shares) | 74,000 |  |  |  |  |  |
Issuance of stock in connection with employee stock plans | $ 6,065,000 |  |  |  |  |  | 6,065,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 217,000 |  |  |  |  |  |
Repurchase of Class A common stock (in shares) | (306,000) |  |  |  |  | (228,737) |
Repurchase of Class A common stock | $ (31,548,000) |  |  |  |  |  | (31,548,000)
Class B common stock converted to Class A common stock (in shares) | 20,000 | (20,000) |  |  |  |  |
Class B common stock converted to Class A common stock | $ 3,000 | $ (3,000) |  |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | $ 7,832,000 |  | 9,047,000 |  |  |  | 16,879,000
Dividends paid |  |  |  |  | (19,985,000) |  | (19,985,000)
Balance, shares (in shares) at Dec. 31, 2015 | 23,676,000 | 2,542,000 |  |  |  |  |
Balance at Dec. 31, 2015 | $ 258,410,000 | $ 316,000 | $ 38,822,000 | $ (277,000) | $ 530,893,000 |  | $ 828,164,000
Issuance of stock in connection with acquisitions |  |  |  |  |  |  |

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