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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
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Business Acquisition [Line Items] |  |  |  |  |  |  |
GOODWILL | $ 100,722 |  | $ 55,831 |  |  | $ 19,828 |
Genesis |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 2,847 |  |  |  |  |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets | 39,262 |  |  |  |  |  |
Liabilities assumed excluding deferred tax liabilities | (23,506) |  |  |  |  |  |
Deferred tax liabilities, net | 0 |  |  |  |  |  |
Intangible assets | 43,700 |  |  |  |  |  |
Total identifiable net assets | 62,303 |  |  |  |  |  |
GOODWILL | 45,236 |  |  |  |  |  |
Total purchase price | 107,539 |  |  |  |  |  |
RC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 30 |  |  |  |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  | 2,151 |  |  |  |  |
Liabilities assumed excluding deferred tax liabilities |  | (1,932) |  |  |  |  |
Deferred tax liabilities, net |  | (573) |  |  |  |  |
Intangible assets |  | 705 |  |  |  |  |
Total identifiable net assets |  | 381 |  |  |  |  |
GOODWILL |  | 4,072 |  |  |  |  |
Total purchase price |  | $ 4,453 |  |  |  |  |
GmbH RC and Genesis |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 2,877 |  |  |  |  |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets | 41,413 |  |  |  |  |  |
Liabilities assumed excluding deferred tax liabilities | (25,438) |  |  |  |  |  |
Deferred tax liabilities, net | (573) |  |  |  |  |  |
Intangible assets | 44,405 |  |  |  |  |  |
Total identifiable net assets | 62,684 |  |  |  |  |  |
GOODWILL | 49,308 |  |  |  |  |  |
Total purchase price | $ 111,992 |  |  |  |  |  |
LDD |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 1,002 |  |  |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  | 1,346 |  |  |  |
Liabilities assumed excluding deferred tax liabilities |  |  | (708) |  |  |  |
Deferred tax liabilities, net |  |  | (538) |  |  |  |
Intangible assets |  |  | 3,614 |  |  |  |
Total identifiable net assets |  |  | 4,716 |  |  |  |
GOODWILL |  |  | 5,276 |  |  |  |
Total purchase price |  |  | 9,992 |  |  |  |
ILT |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 969 |  |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  |  | 14,353 |  |  |
Liabilities assumed excluding deferred tax liabilities |  |  |  | (11,669) |  |  |
Deferred tax liabilities, net |  |  |  | (2,004) |  |  |
Intangible assets |  |  |  | 19,140 |  |  |
Total identifiable net assets |  |  |  | 20,789 |  |  |
GOODWILL |  |  |  | 19,467 |  |  |
Total purchase price |  |  |  | $ 40,256 |  |  |
OptiGrate |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 3,714 |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  |  |  | 1,351 |  |
Liabilities assumed excluding deferred tax liabilities |  |  |  |  | (687) |  |
Deferred tax liabilities, net |  |  |  |  | (2,068) |  |
Intangible assets |  |  |  |  | 5,660 |  |
Total identifiable net assets |  |  |  |  | 7,970 |  |
GOODWILL |  |  |  |  | 8,900 |  |
Total purchase price |  |  |  |  | $ 16,870 |  |
LDD, ILT, And OptiGrate |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 5,685 |  |  |  |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  | 17,050 |  |  |  |
Liabilities assumed excluding deferred tax liabilities |  |  | (13,064) |  |  |  |
Deferred tax liabilities, net |  |  | (4,610) |  |  |  |
Intangible assets |  |  | 28,414 |  |  |  |
Total identifiable net assets |  |  | 33,475 |  |  |  |
GOODWILL |  |  | 33,643 |  |  |  |
Total purchase price |  |  | $ 67,118 |  |  |  |
BSI |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 0 |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  |  |  |  | 219 |
Liabilities assumed excluding deferred tax liabilities |  |  |  |  |  | (133) |
Deferred tax liabilities, net |  |  |  |  |  | 0 |
Intangible assets |  |  |  |  |  | 1,395 |
Total identifiable net assets |  |  |  |  |  | 1,481 |
GOODWILL |  |  |  |  |  | 0 |
Total purchase price |  |  |  |  |  | 1,481 |
Menara |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 520
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  |  |  |  |  | 9,585
Liabilities assumed excluding deferred tax liabilities |  |  |  |  |  |  | (1,876)
Deferred tax liabilities, net |  |  |  |  |  |  | (123)
Intangible assets |  |  |  |  |  |  | 19,400
Total identifiable net assets |  |  |  |  |  |  | 27,506
GOODWILL |  |  |  |  |  |  | 19,325
Total purchase price |  |  |  |  |  |  | $ 46,831
BSI and Menara |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 520 |
Assets acquired excluding cash and cash equivalents and deferred tax assets |  |  |  |  |  | 9,804 |
Liabilities assumed excluding deferred tax liabilities |  |  |  |  |  | (2,009) |
Deferred tax liabilities, net |  |  |  |  |  | (123) |
Intangible assets |  |  |  |  |  | 20,795 |
Total identifiable net assets |  |  |  |  |  | 28,987 |
GOODWILL |  |  |  |  |  | 19,325 |
Total purchase price |  |  |  |  |  | $ 48,312 |

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